Insert the disc and allow it to remain undisturbed until an "Easter Eggs" menu appears.
Hidden clips
Select the "Special Features" option at the main menu. Highlight the "Play Movie" option and press Up to highlight a popcorn kernel. Press Enter to view a pre-production scene. Select the "Special Features" option at the main menu. Highlight the "Play Movie" option and press Up, Up to highlight a popcorn kernel. Press Enter to view an alternate scene from the movie.