When watching TV at the Bellow's house, the first shot of the TV shows it is against the wall. But when Tony walks over to the TV to "fix" it, the TV has no wall behind it allowing him to hit it on the back.
Tony's car has a stripe/bend down the side. When the car is crashed/damaged, the front panel that is dented doesn't have the stripe in it so it is obviously from another car and can't be the one on the car when it crashed. When the car goes back and forth between fixed and broken, that stripe appears and disappears.
As Tony is trying to explain to the policeman why no one was driving his car, a crew member apparently bumps a reflector causing the light on the house in the background to shake back and forth.
As the door falls off the station wagon at the car yard, a crew member is clearly seen crouching in the back seat.