Hidden clip
Select the "Special Features" option at the main menu. Select "Cut Scenes", highlight the "Evil Council's Love Tacos" option and press [Right] to highlight a hidden silhouette of a man. Press [Enter] to view the clip.
Select the "Special Features" option at the main menu. Highlight the "More" option and press [Up] to highlight a hidden cow. Press, [Enter] to view a slow motion clip featuring a cow's udder.
Extra scene
Advance to 0:80:42 seconds for an extra scene (featuring the Chosen One's master getting eaten by a hawk) that does not appear in the movie or in the "Deleted Scenes" menu.
Hidden commentary
Press [Audio Change] to cycle through the English, French, and Spanish commentary until getting comments from the director. You can also listen to the lines of the characters undubbed, where the Chinese characters speak in that language and Steve says some funny lines that make no sense. Also, the final audio selection is a man reading the lines from the script.
Hidden message
Change the audio option to "Kung Pow! The Lost Book On Tape Version" through "Extra Audio Tracks" at the "Special Features" menu. Go to the "Scene Selections" and go to the end credits. Skip to time indexes 80:46 or 1:20:46 to see Master Tang get eaten by a hawk. You cannot hear him speak on this audio track, but at the end when the screen starts to fade, you will hear the man reading the scripts say something.