Easter egg: On disc 1 of the Special Edition set (the feature movie), on the main menu, the circle with the W and the 214 value (which changes) is a link to a short animation test clip. (I could only get to it on my computer, not my DVD player).
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.