The Simpsons Game Codes -

Pet Homer mini-game: Homer actions:
When using Pet Homer, tap his right knee to make him kick. Tap his left foot to tickle him.

Pet Homer mini-game: Trip Maggie:
Tap Maggie when she appears to make her fall over.

Clichés:
Complete the indicated tasks to unlock the corresponding cliché


Invisible Wall: In the "Mythos Of Marge" level, on the cigarette nest jump to left and get very close to the wall. 
Chasm Death: In the "Bartman Begins" level, when you get to the gargoyle head do not press the button. Run over the edge. 
Water Warp: In "The Land Of Chocolate" level, when you get to the bourbon biscuits have a swim in the liquid chocolate. 
Double Jump: In "The Land Of Chocolate" level, simply double jump.