Enter the following codes at the 'Cheats' screen:

Block party:
R1, , L2, R2

Power game:
R2, , L2,

Fast clock:
Circle, Cricle, , , , , L1, L2.

Never Miss:
L1,L1,L1,R1,R1,,

Perfect field goals:
, , , , , , R1, R2

Shot release text:
L1, L1, R1, R1, , , , .

Black ball:
R2, R2, , L2

ABA ball:
, R2, , R2

Brick City outfits:
R1, L2, R1, L1, , , R1, L1

Cowboy outfits:
, R2, R2, R1

Elvis outfits:
, L2, R2, L2, L2, R2, L1, L2

Santa outfits:
R2, L2, R2, L2

Tuxedo outfits:
L2, L2, ,

Kung-Fu outfits:
, , , L1

Play as Lil' Romeo and Master P:
Buy the most expensive P.Miller clothes for the five man squad at the Footaction store. Once you have spent enough money they will appear outside the store as playable characters.

Play as Xzibit:
Beat the Lord Of The Court mode under any difficulty setting.

Unlock Silk The Shocker:
Beat the Lord Of The Court in Shakespeare Park.

Unlock Cypress Hill, DJ Muggz, and Bobo:
Beat World Tournament on 'Greatest Of All Time' difficulty.

Thanks to Revolution readers james hillert, Phil G, T!DOGG, and martin brody!