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To use the following cheats, enter the code while in the “Extras” menu screen. Successful entry will result in a sound effect.

Unlimited power for all characters
Plus, Left, Right, Plus, Minus, Z

Unlock all Movies
Minus, Left, Minus, Right, Plus, C

Unlock all Cliches
Left, Minus, Right, Plus, Right, Z

(Cheat Via: GameSpot)