Fraternity teams
Press Up, Down, Left, Right, Up Down, Left, Right at the title screen. The bonus teams will appear under the team selection option.
Power-up dunks
Press Left, Right, Up, Up, Left, Right at the "Tonight's Matchup" screen.
Small players
Press Up, "Shoot", Down, "Shoot", "Pass", "Pass" at the "Tonight's Matchup" screen.
Unlimited whirlwind
Press Left, Right, Left, Right, "Pass", "Shoot" at the "Tonight's Matchup" screen.