Crossovers
- None recorded

Cameos/References
- Penny Arcade - Anyone who recognize those two wang-speaking fellas? #32
- PvP Online - Frances are not so easily intimidated... not by a Quake-challenge anyway! #102
- Penny Arcade - When Tycho means he'll beat someone at games, he takes it all the way to total humiliation! #102
- Sinfest - They may be from two different comic worlds, but being Satain is still a question about style! #102
- Zortic - Looks like Splink is around to gather help and support for a hunger-saving invention! #102
- Bob the Angry Flower - Bob gives a crap about saving the world... but an invention that beats people up! #102
- Sluggy Freelance - Seems like Riff has not problems finding friends when there's beer involved! #102
- Real Life - Greg enjoys a game of D&D with a real pro this time! #102

Casey & Andy cameos/references can be found in:
- Narbonic - Casey and Andy both take part in the reception among the Mad Scientists! 01-12-2004
- Irregular Webcomics - Perhaps David should concentrate on his comic instead of reading Casey & Andy?! 28-02-2006
- The Whiteboard - Look like Roger, in his panic, adopts Casey and Andy's invention-naming convention! 03-07-2006
- The Mansion of E - Looks like Casey & Andy's Gapomatic was one of the things to be shipped! 04-12-2006
- CameoComic - Casey has gone down in the battle against the EOU, hopefully not mortally wounded? 14-09-2007
- The KAMics - Looks like Quantum Cop has been called in to help keeping the crimescene seperated from reality! 17-12-2012

Webcomic artist appearances/references:
- Irregular Webcomics - Hmm... after a 1000 strips, somebody has noticed David has gotten a new monitor! 01-03-2006

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