Cheat mode:
Enter one of the following codes to activate the corresponding cheat function. There is a five minute lockout before a code can be re-enabled. To bypass this, save the game after a code has been enabled, quit the game, then reload your saved game.
All movies:
Press Triangle, Square, Triangle, Square(2), L3 at the "Join The Family" main menu.

$5,000:
Press Start to pause game play then press Square, Triangle, Square, Square, Triangle, L3.

Full health:
Press Start to pause game play then press Left, Square, Right, Triangle, Right, L3.

Full ammunition:
Press Start to pause game play then press Triangle, Left, Triangle, Right, Square, R3.