From the disc's main menu go to the [Cast and Crew Biographies]. In the biographies of actors Tim Allen, Sigourney Weaver, Alan Rickman, Tony Shaloub, Daryl Mitchell and Sam Rockwell you will find small buttons that you can highlight using your remote. If you press [Enter] they will reveal some interview clips with the star talking about the movie. You can find the same buttons in the biographies of director Dean Parisot and the movie's Creature Effects crew.
Alien Audio Channel
While watching the movie, press the audio button on your dvd remote and if you keep pressing it, you can view this movie in an alien language.