On the discís main menu, press the 'Left' arrow key on the remote to highlight the center car. Now press 'Enter' and you'll get to see a list of quotes from the movie.
Another can be found in the main menu. Press the 'Left' arrow key on the remote control to highlight the Banzai car and then press it once again and the yellow button in the upper left corner will be highlighted. Press 'Enter' now to get a look at alternative menu designs for the DVD.
Another can be found in the 'Special Features' section. Select the 'Deleted Scenes' and then highlight the 'Special Features' menu entry at the bottom of the screen. Press the 'Left' arrow key now to highlight the melon and then press 'Enter' to get access to a made-up newspaper article about Perfect Tommy's experiment with dropping watermelons from the sky to relieve world famine.
Inside that hidden feature there is another one. On the newspaper clipping, select the 'More' button to get to the second page and there press the 'Up' arrow key to highlight the Buckaroo Banzai logo. It will give you access to a brief interview with the director about the whole watermelon question, and a bit about a recipe for 'Chicken in a Watermelon'.
Reviews: DVD Talk also has a review of
The Adventures of Buckaroo Banzai by DVD Savant.