When State Trooper Ed and Captain Esteridge escort Jim to the Semi, the police are talking nervously without stopping. However you can hear the English "Hold-your-fire" in almost audio tracks of almost every language, such as French, German, Italian, Spanish. This is because the maker forgot to treat it as audio rather than environment noise.
When the cops are loading John (Rutger Hauer) into the prison bus it appears to be either early in the morning or late at night based on the position of the sun and the low light in the sky. At the same time C. Thomas Howell and the Captain are driving away and the sky is very bright and sunny. This is interspersed with scenes of John inside the prison bus where you can see the sky is dimly lit. When C. Thomas Howell catches the prison bus it is very bright again. After the dramatic conclusion we see a silhouette of C. Thomas Howell at what appears to be dusk. It was all over the place.
After 2 Ford LTD Sheriff cars are destroyed, 3 State units join the pursuit. At first, all 3 state units are Chrysler M-Bodies cars. However when the chopper is destroyed, the first State unit which flips becomes a Ford.
When two police cars try to shoot out tires, not only can you see the ram holes in the bottom of the cars, just after that you can see a car battery and large air-tank fly out of a trunk. The air-tank is the power for the ram that flips the car. And that cars battery should have been in the front, not the trunk.
When Jim enters the abandoned garage, birds fly in front of the camera for dramatic effect. Though the hole in the floor seems to be intentional, the person visible pushing the birds out from said hole was probably not.
The guards in the prison transfer bus carry guns which they then lay aside so they can start playing with cards during the ride. Guards are forbidden to carry guns in a situation with the slightest possibility of prisoners grabbing the weapons, and no competent guard on such a dire job would dare to take his attention off prisoners to engage in frivolities such as card-playing on duty.
In the scene where John kidnaps Nash from the motel room, Jim is in the bathroom tying his shoes having just gotten a shower, when he hears the TV come one, which is to mask the noise of Nash being kidnapped. In the short time he calls her name three times, then runs out, John has been able to drag her to a truck, set her down, disconnect the trailer, pull the truck up a bit, and tie her to it, and the police are already showing up. There wouldn't have been anywhere near enough time to do all of that.
Jim picks up a dead cop's empty revolver. When he learns to reload, they're no shells in the gun. The gun is a revolver, and does not eject it's shell casings when fired. Obviously John had emptied it and left if for Jim to find, as evidenced by the scene at Roy's cafe, where he asks Jim if he had checked the gun, then leaves him the ammo.
The goof items below may give away important plot points.
At the end, Halsey brakes and Ryder is thrown out of the windshield. We see that he lands a few meters away. He gets up and goes for his shotgun which lies 3 or 4 meters away from him. He then starts approaching the car while shooting (in fact he takes at least 8 steps towards it), but the distance between him and the car is about the same or even bigger, as the distance between the car and the spot where he picked up the shotgun.