Other mistake: When the kids spray paint the van purple, they somehow paint it in five minutes, and they somehow manage to get not one spot of paint on the windows even though they are outside with a wind because of the moving cars.
Visible crew/equipment: When Martha the meter maid is being pulled along on a rope behind a car, she is stood up and the bottoms of her shoes are supposedly sliding along the ground. But in some shots the stuntman is wearing roller-blades.
Factual error: After the policeman commandeers the old lady's car he finds out quickly that there are basically no brakes. Later he is doing K-turns, and all different maneuvers that aren't possible using a car without working brakes.
Continuity mistake: When Tom Arnold pulls over because he realises he doesn't have his licence, he pulls into the spot and stops. Then it cuts to a shot inside the car and you can see out the window that they are still moving and then come to a stop again.