(at around 2 mins) In the beginning scene where The Creeper is in pursuit of the elderly couple driving, you can see a stunt driver wearing a regular baseball cap driving The Creeper truck. Then when scenes cut back and forth between the vehicles, you can see someone wearing a creeper hat.
The film supposedly takes place at night, but there are beams of bright white light shining through all the windows, at all times.
(at around 1h 3 mins) A character steps on a bear trap and had his leg shredded but somehow is able to walk around limping the rest of the film as well as walk up flights of stairs without any support.