Behind-The-Scenes
Go to the special features menu and highlight [Filmographies]. Press Right and the picture of Jack Black will change to his Eagle Mascot costume. Then press [Enter] to watch various takes of his cheerleading.
Alternatively, after Jack Black turns into the eagle press Right twice more and the picture of Steve Zahn will change to him with a racoon on his head. Press [Enter] to see the making of the racoon scene.