The Show is an esteemed, award-winning franchise and you can bet that every last entry was stellar. One of the older ones has some stuff to unlock, too. This was before Trophies, so codes were still in vogue... ;)
Codes
When at the main menu, enter the following:
| All Classic Stadiums(won't show up in profile, only exhibition) | Down, Up, Right, Down, Up, Left, Up, Down |
| Army Camouflage Uniforms | Down, Left, Up, Left, Right, Left, Right |
| Gloden/Sliver Era Players | Left, up, right, down(2), left, up, down |
| Maximum Break For All Pitches | Right, Up, Right, Down, Up, Left, Left, Down |
| Maximum Speed For All Pitches | Up, Left, Down, Up, Left, Right, Left, Down |
| Unlock All Bonuses | L1, L2, L3, L3, R1, Circle, Square |