On disc 2, from the "Cast and Crew Filmographies" menu, select "Jason Mewes". When his Filmography appears, the word "Balls" appears on the top of the screen. Select it and press enter.
On disc two from the main meno go to the filmographies. On the first page of James L. Venable's filmography if you enter 19 on your remote control (you may or may not need to press enter after entering the 1 and the 9 depending on your player) you'll get to see a short clip of a very young Jim and his keyboard!
All easter eggs were generously submitted by Satelk