The Konami Cheat
This code allows you to view the Major League Players in the Created players menu. Enter Up, Up, Down, Down, Left, Right, Left Right, L1, and R1 in the Created Players Menu.
Alvin Lockhart's batting stance and pitching form
Enter Right, Left, Up, Down, Down, Right, Right, Up, Up, Left, Down, and Left in the main menu. (Alvin's stance and form is available in the Shop after entering code. You will hear a chime if the code is entered successfully)