Spank The Monkey mini-game:
In the Spank The Monkey game, notice that the monkey's butts become red when 
Mr. Mackey hits them, and become redder every time they are hit. If you 
forget the pattern, watch the order that the butts turn back to normal.

Better variety of mini-games:
Play as Cartman if you want a better variety of mini-games. He is the only 
character that can play the Rodeo and Beefcake mini-games.

Beefcake bonus:
Eat every single can of Weight Gain 4000 in the Beefcake mini-game to see a 
bonus animation at the end.

Easier mini-game:
To stop your fingers from hurting while playing the Eat This, Stampede, and 
Tug Oh War.mini-games, try holding the controller like this: hold the left 
part of your controller with your left hand, and press Up with your thumb. 
Use the middle and index fingers on your right hand to tap A and B.