Big heads:
Repeatedly press X rapidly until tip off. Press Start after the tip off to pause the game, then resume.

Small players:
Repeatedly press Z rapidly until tip off. Press Start after the tip off to pause the game, then resume.

Display shot percentage:
Hold L until tip off. Press Start after the tip off to pause the game, then resume.

Hidden teams:
Press Left, Right, Up, Down, R, L, A, Down at the main menu, with the "Exhibition Game" and "New Season" options. The sound of the buzzer will confirm entry of the first part of the code. Immediately press Left, Right, Up, Down, R, L, A, Up. The sound of the buzzer will confirm correct entry of the second part of the code. The Left Field Lefties and Monsters teams will now be selectable. The Left Field Lefties team is composed of the developers of the game, the original Left Field staff, who were all left handed.