I found these Easter Eggs at http://www.dvdreview.com/html/hidden_features.shtml
I haven't tried these myself yet, but it might be fun to try.

The first DVD of the set contains three different menu themes that are selected randomly upon boot-up of the disc. However you can select any of the three themes directly by pressing the '1', '2' or '3' key during the FBI logo.

On the first disc you can also find a blooper reel with DVD production credits. To see it highlight the THX logo on the screen and then press the numbers '1138' on your remote control. Alternatively you can also directly access Title 3 on the DVD for this feature.

On the second disc of the set select 'Dex’s Kitchen and Still Galleries.' In the following menu select 'Dex’s Kitchen' and in the menu screen that follows highlight the 'Main Menu' menu entry. Now press the 'Left' arrow key on your remote control and a small panel will be highlighted. Press 'Enter' now to see an additional still gallery with humorous posters from a College Campaign.