Hang on Rim: 
After making a two-handed dunk, hold B and you will hang on the rim. If you hang too long, you will
receive a technical foul. 

Hidden Teams: 
Hold L and select a Pre-Season game by pressing A. If you scroll all the way to the right, there will
be three new teams: Nintendo, N64 and Left Field.

Big Heads:
During a game, press Start to pause. Press Right on the Control Pad twice, Left on the Control Pad,
R Button, Z Button, Start, A Button, Start, A Button, Start, Z Button. If you do it correctly and
quickly, when you return to the game the players will have big heads. 

Disco Floor:
After you start a game, pause and enter the following controller commands: A, C-Up, Control Pad
Down, Control Pad Up, C-Down, R, R, B, C-Right, C-Right, Z. Get ready for the light show!
(NOTE: You will go into instant replay mode as you enter this code-- this is supposed to happen!)