As Chevy Chase once so eloquently said, "Be the ball." Enter that code (betheball) at the Code Selection screen.
To unlock even more players for the Hidden Team (make sure you enter that code first), go to the Code Selection screen and enter: Marrinson.
Every game needs a big head mode. To get NBA 2K2's, go to the Code Selection screen and enter: heliumbrain.
To unlock some extra jibes, go to the Code Selection screen and enter this code: sohappy.
To unlock a hidden team, go to the Codes Selection screen and enter: VC.
To unlock infected players, go to the Code Selection screen and enter this code: tvirus.
To put your ballers in some fly, old school threads, go to the Code Selection screen and enter this code: the70slive.
To unlock some interesting extra commentary, go to the Code Selection screen and enter this code: whatamisaying.
To unlock monster players, go to the Code Selection screen and enter this code: alienbrain.