NBA 2K2
Dreamcast

Big Head Mode:

At the code screen type in heliumbrain and you should enable giant heads.

Enable Special Teams:

If you type in vc at the code screen then you will enable the special teams.

Nutty Commentary:

Type in what am I saying at the code screen to enable crazy commentary.

Ball Camera:

Enter "betheball" with no spaces and no caps in the code menu.

HINTS:

Unlock Wang Zhizhi of the Dallas Mavericks:

From the main menu, go to customize, teams, lineups, set active players, then you can substitute any Mavericks player for Wang.