Select Menu Animation
At the FBI Warning screen, press  on your remote control for the Alien Sacrifical Chamber background or  for the Predator Wrist Panel-Computer background.
Bonus Interview (UNRATED EDITION ONLY)
On disc two, go to [Marketing] and highlight [HBO Special]. Press [Right] to see a facehugger icon appear in the upper-right corner. Press [Enter] and you will see Tom Woodruff tell his crew about his acting days as the alien creature.