The last basketball game before the end, where Mickey is officiating whilst his friends wait for him at the restaurant, is made to seem to happen in LA. But in the shots of the game floor, the NY Knicks and Madison Square logo is clearly emblazoned on the hardwood.
In the scene depicting Kareem Abdul-Jabbar's farewell-in-Detroit game, there's an NBC Sports banner in the middle of the scorers table. Kareem's final season was 1988-89, NBC did not start broadcasting the NBA until the 1990-91 season.
In the Pistons/Lakers game when Mickey has his meltdown, the court is clearly the Phoenix Suns' court. The floor is purple instead of the Pistons' blue, and you can see the word America of "America West Arena" when he throws out Isiah Thomas.