A cow is held by the big martian on the backglass.
One of the animals that you must shrink in the Big-O-Beam mode is a cow.
A plane on the backglass has the text 'P2K' and 'Gomez' on the side.
A cow can be beamed up in 'Alien Abduction'.
In the animation for regular multiball a Saturn-like planet whizzes by. On the rings of the planet stands a cow.
"Mortal Kombat" line : in the Secret Weapon mode, get the martians life bar down all the way and the words 'Finish Him!' appear.
In Attract mode, press the following sequence : B, 1R, 1L, 2R, 1L, 3R, 1L, 1L