When Jill is talking to the doctor at the market, watching Gregg, she picks up a piece of fruit to eat. As she puts it to her mouth it appears untouched. In the immediate cutaway scene, the fruit is half eaten.
When Joe pushes Stressar's truck upside down and people witness the accident a woman gets out of her car and puts her left hand on the roof and looks to see if everyone is okay but in the shot after Joe pushes his way out of the trailer the woman disappears and a young guy gets into the car and leaves.
Part of the film is set in California. In Los Angeles and at the carnival near the beach, there are police cars with their colored lights on. All the police cars are missing a steady red light in the front. By the California vehicle code, all emergency and law enforcement vehicles are required to have a steady red light facing forward.