Easter egg: On the regular DVD (not the special 2 disc edition), go down to Special Features, press the left arrow then press the up arrow and it will highlight the B and L logo in the upper left hand corner of the screen. It will take you to "Geek-o-rama", a feature about the Pixar employees.
Easter egg: On the Main Menu, you can find a sequence of the crew (not including any of the original actors) performing "We Rock". Place your arrow on Play, then go up, and you will see the guitar string tuner on the CAMP ROCK logo slightly highlight.