Sienna Miller plays a 38 year old and Aaron Paul plays a 35 year old, but he is three years older than her in real life.
In one of the scenes while driving a car with Pennsylvania tags the annual vehicle inspection stickers are on the passenger side windshield of the vehicle. They belong on the lower driver's side windshield.
During most of the movie (which takes place in Pennsylvania), most of the characters drink Rolling Rock beer, which is made in Latrobe, Pennsylvania.