In Apple Guide, v1.2, there is a way to see a list of credits. I don't know how to trigger the egg but I found it by opening the Apple Guide extension through ResEdit. After opening the TEXT resource and double-clicking on “Who?”, you will see this:
Version 1.2 of Apple Guide is brought to you by:
Greg “twin-turbocharged” Brewer
Peter “and furthermore” Commons 
Dave “do the right thing” Falkenburg
Bill “oh yeah, that one” Foster
Amy “pound on it” Hansen
Brent “I’m excited” Horger
Josh “just one more feature” Jacobs
Glenn “let’s get organized” Katz
Sue “will do” Kuo
Brian “that’s next on my list” Lawley
Dave “cursorman” Lyons
James “I’m in the chips” Miyake
John “follow me, I’m lost” Powers
Alex “you can quote me” Rosenberg
In the French System, all of the text is in French except for the very last name, which was an addition for the French Apple Guide: Mario "Ah que coucou" Teixeira. This translates literally as "Oh what peekaboo". It is an expression from French singer Johnny Halliday who is supposed (according to a TV program called "Les Guignols de L'Info") to always say "Ah que coucou". From: Alexandre Enkerli (EnkerliA@ERE.UMontreal.CA)
 
Macintosh Guide
When opening Macintosh Guide from the Apple Guide menu, you will be presented with what's called the 'Howdy Screen'. This is a preliminary introduction screen telling a little about the database the user just opened. If you press Control, Command, and Caps Lock down, and click in the content of the window (before you do anything in the window), you will see a list of credits containing the names of those who have worked on Apple Guide. From: Devon Hubbard (devon@apple.com)
Ô£øIn Macintosh Guide, System 7.5.3, do a search for "Bill Gates". This will bring up DOS and everything involving PCs on a Mac. "Bill" and "Gates" do not register in the directory, and every other name I could think of was treated as two words, meaning that Gates was not a normal entry and is indeed an easter egg. Boy, Apple's help features just keep getting easier to use. From: Matt Nichols (cardsfan@aksi.net)
Ô£øApple Guide 1.4.1 & Macintosh Guide 2.2
Apple rarely, if ever, reacts to the discovery of an easter egg. Well, I have to applaud the Apple Guide team on this one. With the release of System 7.6 (and version 2.2 of Apple Guide), Apple had a little fun with the Macintosh and Apple Guide eggs explained above.
In Macintosh Guide, the credits have changed to a help tab saying "How do I" for one topic and "Find the credits?" for the subtopic. I looked; I can't find them. The engineers also removed the credits in Apple Guide's resource, which have been replaced by a poem:
As the Lighthouse keeper climbed the stairs,
the keeper knew that future generations
would benefit from today’s work.
(poem from Dan Berger; bergerdg@aol.com)
 
Apple Modem Tool (1.5.5)
The Apple Modem Tool can be accessed in the connection settings window by selecting it under Method. In order to access this window, you need to have some sort of terminal modem program (like Z-Term or Claris Works) that will give you access to it. The easter egg involves the version number (no surprise) which is in the Port section of the window, on the right hand side, across from "Hand Shake". Just click on it. People, young and old, don't try this at home. It is not worth the trouble.
 
Ô£øAppleScript (1.1.2)
From: Dan Berger (bergerdg@aol.com) AppleScript 1.0 Code Name: Cheeze Whiz, Toy Surprise, Gustav AppleScript 1.1: Guava Surprise, Pure Guava
Open the AppleScript extension with ResEdit. Look at the STR# resource, ID 5000. String number 11 says: "This is the magic OS error number returned by the operating system. For technical gurus only."
Go to the Apple Programs chapter for more on AppleScript applications…
 
Ô£øAppleVision (1.5.3)
In the AppleVision extension there is a hidden picture, not accessible through ResEdit, of the AppleVision team. You will need CanOpener to see it. This picture is marked in the code by the phrase "AppleMark".
 
Ô£øColor Picker (2.1)
From: Dan Berger (bergerdg@aol.com)
You need to be in a graphics program to see the Color Picker in action. The color picker appears when you want to choose a special color. A simple way to see the Color Picker is to go to the Finder and select "Preferences…" in the Edit menu. Click on one of the colored buttons to choose a new color. The Crayon Picker is one of your options in the left-hand panel.
•Advance your computer's date by a few years and the crayons in the crayon picker will be dulled.
•Go to the Color Picker and hold down Shift while selecting the Crayon Picker. As you drag your cursor over the different crayons, you will notice that the crayon names have changed to credits. The names can be found at I.D. -5749 of the STR# resource. It is a list of names and phrases.
•Now look at IDs -5755 though -5735 in the STR resource of the actual extension:
-5755 We have lingered...
-5751 in the chambers of the sea…
-5746 by sea-girls wreathed with seaweed red and brown…
-5742 'til human voices wake us…
-5735 and we drown.
Ô£øThese are the closing lines of T.S. Eliot's Love Song of J Alfred Prufrock, a meloncholy poem bemoning life in general from the point of view of the bourgeoise. From: Jonathan Lipkin (jlipkin@ramapo.edu)
You see, not only are Apple engineers good at making software, but they can quote literature too!
 
MacsBug - System Extension (6.5.4)
MacsBug: A contraction of Motorola Advanced Computer Systems Debugger
•Balloon Help the program's icon to see "This file provides programmers with information proving that it really was a hardware problem...".
•Hold down Control when you start-up your computer. If you have MacsBug installed it will immediately go to the program. Then it will say "Welcome to MacsBug (thanks for holding down Control)". I thought that was kind of odd. Type G and push Return to continue your start-up.
•In the MacsBug 6.5.2 file, use ResEdit to open the only "mxnx" resource. Then use ACSII find and look for "Ol'" (Oh Ell apostrophe) and you'll find this:
Ol' McDonald had a farm...
From: Andrew Koch (andrew@mailit.pgh.net)
•In version 6.5.4a1 of MacsBug, resource hfdr, ID -5695 says:
"MacsBug is a low-level debugger. It it best served chilled with fish, hearty meats, and cheeses. Do not use while operating heavy machinery or driving a motor vehicle. Do not combine with medication."
Conflict Catcher (4.03) supposedly displays the above comment in its information window when MacsBug is selected.
•In MacsBug, if you're using RAM Doubler and enter the command VMDump you get: "Yo! you're running RAM Doubler - not VM!"
The two eggs directly above are from Yann Duguay (yanndug@microtec.net).
 
Memory Manager (1.2.1)
There is an extention named Memory Manager. Opening it with a text viewer (BBEdit will do the trick) will display this line near the end of the jumbled programmer's code: "Give this Memory Heap a description. Dead heap, dead heap, dead heap!"
 
OpenDoc‚Ñ¢ - Sytem Extension (1.0.2)
OpenDoc: Amber, Exemplar, Jedi
The OpenDoc program itself, which resides in the OpenDoc Settings folder in the extensions folder, has an easter egg in the STR# resource. Go to ID 482 and scroll down to string 2. You will see the the text "They're EVERYWHERE!" (Works for versions 1.0 & 1.0.2; gone in version 1.2.1–System 8)
PowerTalk
From: Raul Regalado (RRegalado@eworld.com)
Using a text reader, open any PowerTalk info card (for example, Untitled Info Card). Among a bunch of other words and gibberish, the phrase "silence=death" appears several times. Note: The info card has to be on the desktop or any location other than a PowerTalk personal catalog for this to work.
 
QuickDraw 3D
QuickDraw 3D Code Name: Escher From: John M. Sully (jms20@po.CWRU.Edu)
Turn on Balloon Help and place the cursor on the QuickDraw 3D extension. At the bottom of the balloon, you should see the message
"Flatland no more. Come and follow us into the Third Dimension".
Ô£øThe resource of the QuickDraw 3D Install script contains two graphics in the PICT resource. One is of the main splash screen (ID# 1000) which you see before you install the program, and the other (ID# 1001) is the same type of thing, but a bit different (it does not exist in version 1.5.1 of QD3D). Instead of the normal icon, there is a smiley face. And instead of the usual instructions and descriptions, there is a wacky version. I have no idea how to access this, but it is a lot of fun to read if you have ResEdit. From: Greg Morin (morin.3@nd.edu)
 
Below is what the graphic normally says and what is printed in the egg:
Normal: QuickDraw 3D provides new 3D graphics services directly in System Software.
Egg: QuickDraw 3D provides new 3D graphics services that add a new dimension to your otherwise boring computer.
Normal: Your Macintosh needs certain software to use QuickDraw 3D. The installer will choose the recommended software for your Macintosh, and place it in the System Folder.
Egg: Your Macintosh needs certain software to use QuickDraw 3D. The Installer places this software on your disk in places you would never imagine - or care.
Normal: Choose "Custom Install" only if you are sure you want to override those recommendations.
Egg: Choose "Custom Install" only if you know what you are doing, and know the secret handshake.
Ô£øQuickDraw 3D Viewer
From: dwilson@cybcon.com (Doug Wilson)
In the QuickDraw 3D Viewer there is a picture of a Golden Lab dog. However, you will need to view it with CanOpener because nothing else seems to work. QD3D Viewer is an OpenDoc - based 3DMF viewer. It allows you to embed 3DMF files into OpenDoc documents.
 
QuickDraw GX
Code Name: El Kabong, Sarano, Skia From: Charles Wiltgen (cwiltgen@mcs.com)
•Dragging the icon of the QuickDraw GX extension over to the desktop printer will print a list of credits of the development team for the extension. I recommend looking at the preview instead of printing it to save time, paper, and ink.
•Select a GX desktop printer, hold down Shift-Option-Command and choose "Open" from the File menu. It gives you a very cool, simple demo of GX's geometry capabilities.
•With the N-Up printing extension installed, go to the N-Up panel (in the  print dialog or in the dialog under the DTP printing menu) and
select "1 page per sheet" while holding down the Option key...
...or in the print dialog of any GDGX savvy application (try
SimpleText), click on the "More choices" button at the lower
left, if there isn't a list of plug-in modules to the left. Now, option-
click on the one called "n-up print" and instead of the dogcow showing the page layout there is a small rectangle of credits. Note: You must have more than one printing extension installed.
From: Avi Drissman (ad406@detroit.freenet.org)
 
QuickTime (2.5)
Code Name: QuickTime 1.5 was Dali and Project Warhol
•The development name for QuickTime was Project Warhol, thus a pre-release version, known as the 'warhol' init, had the icon of a Campbell's soup can. In MoviePlayer, go to "About QuickTime..." and watch the credits scroll by. There is some interesting stuff slipped in, including a credit to Andy Warhol.
•Balloon-help the icon to see "Time n. A nonspatial continuum in which events occur in apparently irreversible succession from the past through the present to the future."
•Hold down Command-Option-Q-T at startup. You see either a picture of the QuickTime team (versions 1.0-1.6.2) or a movie with team pictures, names, and a music track (versions 2.0, 2.1). Note: The music may or may not play, depending on how much memory QuickTime can get at that point in the boot process. In version 2.5 there is no music and the movie ends where you see a burning film that says "Inactive Movie". I believe the names listed are in the STR# resource, I.D. -19102.
From: Jonathan Cooper
•In QuickTime 1.6.1 there is a hidden picture that is not accessible through ResEdit. You need to use CanOpener to see it. What the picture shows is 7 QuickTime programmers; one is holding a bouncy-ball and two others are prepared to fight back with highly destructive Nerf weapons. It is best viewed in thousands of colors. This is a very good example of life at Apple. The picture here is in 256 colors. From: Edward Shryane (9427589@ul.ie)
 
•Finally, in the ICON resource at ID's -19135 and -19134 there are two people–probably renditions of the authors. They are also in QuickTime PowerPlug.
  
 
Ô£øQuickTime PowerPlug (2.5)
From: Colin Wirth (starbase74@hotmail.com)
In resource STR, ID #19117, the text reads, "Decompress images compressed with Sean's secret recipe."
 
Ô£øSound Manger (3.2.1)
Sound Manager: DJ, Party Line
In the Sound Manager extension, resource snd, ID 128, there is a sound file named Barking Pumpkin. You can listen to it by clicking on the Sound Manager icon at left.
Ô£øStart-Up Tuner
From: Dieder Bylsma (bylsma@unixg.ubc.ca)
The Start-Up Tuner introduced in System 7.5.3r2 has a file type of 'barf'. Unsurprisingly, it controls a part of your computer's eject mechanism.
 
Ô£øSystemAV (1.3)
Inside SystemAV, in the PICT resource, ID 3804, there is a picture of... well... a guy's head.  ---> <---
Frankly, I think he looks a lot like the guy in the lower-left corner of the QuickTime picture above.
ThreadsLib Extension
From: Patrick Dekker (PDekker@rullf2.MedFac.LeidenUniv.NL)
Open the ThreadsLib extension (System 7.5 and up) with a text reader. The following text is locating near the end of all of the gibberish. The Thread Manager is integrated into System 7.5 and used for Multi-tasking. It is used only with Power PCs because they are the only Macs that handle libraries. This text is also in the System file among other places.
Text Shown:
The Thread Manager
for 68k & PowerPC
THE CAST:
Engineers: Eric & Brad
Qualifiers: BK, RT
Initial Concept: DH
Debugger: ML
Underpaid Process Dude: DF
Animal Handlers: CK, LB
Parents: Mom & Dad
Sisters: KMA, SJP, JRA
Domestic Partner: Amy
Potato Latke Chef: Tam
Bomber Squadron Ldr: DB
City Builder: MF
The Flake: JH
Secret About Box Critic: JR
Beermeisters: DR, MB
Slackers: SH, BT, CL, NS, JY
Hardware First Aid: SM
Special Thanks To:
ERJ, KGB, Bear, DL, DB
and everyone who believes!
Dedicated to our fathers:
Eugene Anderson
Frank Post
 
Ô£øXMODEM Tool (1.1)
The XMODEM Tool extension also has an egg. In the PICT resource, ID 31056, there is a list of credits. It is unkown whether or not the list can be accessed somehow.
