Hidden footage
Select the "Special Features" option at the main menu. Then, select the "Gong Show Acts" option. Press [Left] to highlight a square in the background. Press [Enter] to view additional footage from The Gong Show.
In the Region 2 version, select the "Bonus Material" option at the main menu. Press [Left] to highlight a block under the "Bonus Material" title. Press [Enter] to view a clip of the cast dancing on The Gong Show set.