Continuity mistake: In the beginning of the movie Jeff and his wife were moving to San Diego from Massachusetts. Well, they were driving in their new Jeep (with Massachusetts plates) through Arizona. When Amy comments about how fast Jeff is driving, the camera shot shows the speedometer at 80 mph and the odometer shows the Jeep has only 245miles. That must be a new record from MA to AZ.....(Note: not visible on DVD version of film.)
Continuity mistake: When Kurt Russell's character is parked up on the highway with the truck driver and police, notice how in between shots, the cloud cover completely changes in an instant, not to mention the time of day which is clear from the different shadow angles cast from the Jeep.