Shallow Hal Easter Egg - Tenacious D

Check out Shallow Hal. In the scene where Jack Black is laying on the bed, and Gwyneth Paltrow slings her huge undies at him, and Gwyneth is standing in the doorway, look to the right of the door (as the camera looks at Gwyneth), and you'll see a caricature of Tenacious D, Jack Black's band.