Factual error: During the police chase, the helicopter calls in a car approaching at speed behind the police cars, but he calls it a "late model Trans Am." The Trans Am is an early model at best, as it is a 79 to 81 second generation (of 4) Trans Am. A late model Trans Am would be more accurately described as one of the fourth generation models built until 2002, and look nothing like a 79 to 81, even from the air. It might be considered a character mistake, except that police are generally knowledgable about the make and style of cars from various years. If the pilot or passenger of the helicopter were able to identify it as a Trans Am, they should be able to identify it as an older model, not a late model.
Factual error: When Jim is driving the car and slams on the breaks just before hitting Ryder, the car is thrown forward - during all these scenes, although it is very rainy and windy, the raindrops run down the windshield as if the car is stationary. If the car was driving at a very fast speed and it is windy, the raindrops should be blown upwards on the windshield.
Factual error: There are two instances when Jim and Grace are not wearing seat belts and are involved in big car accident scenes, but don't even fly forward from their seat an inch. The first is when Jim slams the brakes on and sends Ryder headfirst into the windshield. The second is when their car goes flying off the side of the road after dodging the lorry.