Heal
Pause the game during gameplay and press and hold L2 and then press Circle(3), Square(2), R2, R1, Up, Circle, Square. You should hear a sound to confirm proper entry of the code.
Movies and Extras
At the main menu, hold L1 and then press Left, Right, Left, Down, Up, Down, R1, Circle, R2, Square. Go to the options menu and for a Movies and Extras menu.
Level skip
Pause the game during gameplay and press and hold L1 and then press Circle, Left, Circle, Right, Circle, Square, Left(2), Right, R2.. You should hear a sound to confirm proper entry of the code.