Older Than Old School:
When playing an exhibition game, at the versus screen with the 3 small icons
at the bottom press these buttons(once only) Square, X, Circle, Right. This
lets you play the game with an ABA ball.

Taunt Them:
Press B, A, Y, X, or the triggers to taunt the opponent at the free throw line
in a game. Or at the 3-point line in 21.

Cheat Mode:
At the versus screen, press Turbo, Shoot, and Pass to change the icons on the
bottom of the screen. The numbers in the following list indicate the number
of times each button is pressed. After the icons have been changed, press the
D-pad in the indicated direction to enable the code. If you entered the code
correctly, you will see the name of the code and hear a sound. For example,
to enter 1-2-3 Left, press Turbo, Shoot(2), Pass(3), Left. Note: More then one
code may be activated per game.

Result           Code 
Infinite turbo   3-1-2 Up 
Beach court      0-2-3 Left 
Street court     3-2-0 Left 
Home uniform     0-1-4 Right 
Away uniform     0-2-4 Right 
Granny shots     1-2-1 Left 
Show shot %      0-1-1 Down 
Show hotspot     1-1-0 Down 
No goaltending   4-4-4 Left 
No fouls         2-2-2 Right 
No hotspots      3-0-1 Up 
Big heads        3-0-0 Right 
Tiny heads       3-3-0 Left 
Tiny players     5-4-3 Left 
ABA Ball         1-1-1 Right

Thanks to Revolution readers Evan Momen, Marco, Damien Kincel and A.J. Mims!