Directions:

Codes menu:
Select Gameplay at the options menu. Hold D-pad Left + Left Analog-stick Right and press Start.

Hidden teams:
Enter "MEGASTARS" as a code at the cheat menu to unlock the VC, Sega, and NBA 2K2 teams.

Garbage in the streets:
Enter "SPRINGER" as a code at the cheat menu to fill the streets with garbage.