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Nintendo 64 - NBA Live '99 cheats

Ball Flip
When at the line, hold R before shooting the ball to flip it.

Granny shot. 
While shooting a foul shot, hold C-Left

Bonus teams
Go to the "Rosters" and choose the "Create Custom Team" selection.
Type one of the following locations and team names to unlock bonus 
teams:
                          
Location - Team name
Hitmen - Earplugs 
Hitmen - Pixels   
EA - Europals 
Hitmen - Coders   
Hitmen - Idlers   
Hitmen - Rebounds