Debug mode
Pause the game, hold L2 or R2 and press Left, Up(2), Triangle, Right, Square, Left, Triangle, Up, Down, Right(2). -From: BOBPGID@aol.com

Invincibility
Pause the game, hold L2 or R2 and press Right(2), Left, Triangle, X, Up, Circle, Left. -From: BOBPGID@aol.com

Infinite Spirit Spells when acquired
Pause the game, hold L2 or R2 and press Left, Triangle, Left(2), Circle, Left, Triangle, Right, Circle, Up(2), Down. -From: BOBPGID@aol.com