At 13:48 one can see a cold drinks vending machine when David checks if it works then at 17:29 it is offering different drinks when The Hulk breaks it. It's obvious that is was replaced for a retake of the scene.
At 41:12 one of the Robert's brothers reverses into Ricky's car and causes damage to the driver's door then at 41:18 he reverses into the same door again but there is no damage to the door from the previous impact.
At 40:54 one can see a ramp used by a car to go over another during the demolition derby.