Continuity mistake: At the beginning of the movie during the helicopter chase scene, there are two different makes of car used - a four door Nova and a two door Buick.
Continuity mistake: The film starts with a helicopter chasing a car being driven flat out around a winding mountain road. At one stage you see that the nearside rear wheel has lost its hubcap. A few seconds later the hubcap's back.
Continuity mistake: During the car chase on the freeway, when Daryl drives the car with the doctor off a ramp, the camera shows the car head-on as it lands, again as it drives past the camera, and from the rear as it drives away. In both shots of the same ramp scene, a tall adult is in the driver's seat, and the passenger seat is empty. Less than a second later, the rear silhouettes of a tall person driving and a short person in the passenger seat are visible, and three seconds later Daryl is driving with the Doctor.