MLB 2004 Big ball
Pause the game and press L1, L2, L1, L2, Up, Right, Down, Left.
Big heads
Pause the game and press Up, Left, Down, Right, Up, Right, Down, Left.
Small heads
Pause the game and press Up, Down, Up, Down, R1(2), L1(2).
Big bodies
Pause the game and press Up, Down, Left, Right, L1, L2, R2, R1.
No bodies
Pause the game and press R1, R2, R1, R2, Up, Down, Left, Right.
Fast players
Pause the game and press Left, Right(2), Left, L1, R1(2), L1.
Slow players
Pause the game and press Left(2), Right(2), R2(2), L2(2).
Programmer names
Pause the game and press R1, R2, Right(2), Left(2), L2, L1.