"Trog"!: To see one of the Trogs, you MUST destroy the black cat on the brick wall. After having doing so, you'll notice a palm tree behind the brick wall. Quickly blast the palm tree with a CD. If you are successful, Trog will pop out of the tree and waddle his way across the brick wall. He will gain speed back and forth like the cat. If you shoot him a certain amount of times, you will have access to yet another hidden area in the game.
The reason behind Trog's inclusion? After having such a harrowing time with the Trog project, Petro and Haeger wanted to have an opportunity to blow him away repeatedly in their offices!
Game Lock-Up: If you manage to blow up the NON bus while it is going off screen at the end of the level the game wil freeze up. The coins can still be put in the machine and you can add more players but the game just stand there until the operator resets the machine.