Hidden audio
Select the "Cast And Crew Biographies" option at the "Special Features" screen. Select any actor and press [Up] at the biography screen to hear some of their lines from the movie.
Extra deleted scenes
Select "The Munchies" at the deleted scene menu. Once the movie starts, search back and a new part of the deleted scene "The Munchies" will play. Note: If you go back too far the scene will go away and you will have to do it again.