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Continuity: When Marvin is trying to get money to pay off the speeding ticket, Bobby reaches into his pocket with his left hand and takes the cigarette out of his mouth with his right hand. Both hands are in motion as this shot ends. The shot then switches to another angle, and Bobby now has the cigarette in his left hand, both arms already at his sides. There was no time to complete this move between shots.
Audio problem: When the professor is walking out toward the car after Bobby yells at his house, Bobby says, "You're joking with me," but if you watch his mouth, you can tell that he really said, "You're f - -ing with me." The original line was probably cut during editing to keep the PG-13 rating, but it's still a problem.