Toward the end of the movie when the kid walks into the street then turns to shoot the cop through the LF window of the car he does so killing the cop. In the very next scene with him running from the scene, the car is in the background with the LF window rolled up.
When Marcus gets his Mercedes Benz S500, he starts playing
his Window Shopper song. He wasn't a rapper back then. This is not an actual goof, as the tape Marcus was listening to was his demo tape, and he was in the car to drive to a meeting with a producer that was going to listen to his demo.