(at around 15 mins) The car that gets hit by the bus loses its bumper, but the bumper can be seen in a subsequent shot.
From the time that Jim first picks John up and before he throws him out of the car, it seems to turn from day to night and back again several times..
(at around 22 mins) When Halsey is seen running through gasoline, he is wearing blue Nikes with white stripes. A later glimpse seems to show an all white pair.
(at around 1h 25 mins) When the cops are loading John Ryder 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 Jim Halsey and the Captain Esteridge 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 Jim catches the prison bus it is very bright again. After the dramatic conclusion we see a silhouette of Jim at what appears to be dusk. It was all over the place.
(at around 1h 5 mins) 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.
(at around 1h 14 mins) When John kidnaps Nash from the motel room, Jim is in the bathroom tying his shoes having just gotten a shower. Then 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.
The Franchi SPAS 12 shotgun used toward the end of the film has a maximum capacity of 9 shells, assuming a full magazine tube and one in the chamber. From the time Ryder uses it to kill the guards on the bus, blow open the bus door, fire toward Halsey in the police SUV then Halsey finally using it to kill Ryder, at least 11 shots have been fired.
(at around 53 mins) Jim picks up a dead cop's empty revolver. When he learns to reload, there are no shells in the gun. The gun is a revolver, and does not eject its 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.
(at around 1h 5 mins) When Jim and Nash are in the police car with the chopper flying around them in several scenes they are supposed to be driving 55 MPH, but in one shot they are just crawling.
(at around 31 mins) When Jim is arrested and the cop finds the bloody switchblade, they slam him on the hood of their cruiser. As they do, C. Thomas Howell's foot flies up from behind and hits the plainclothes cop in the back of the head.
(at around 30 mins) After one of the deputies fires a warning shot at Jim Halsey just outside the diner, you can hear the shotgun pumping, but the deputy with the shotgun takes no such action.
(at around 17 mins) 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.
(at around 1h 2 mins) 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 car's battery should have been in the front, not the trunk.
(at around 1h 2 mins) During the car chase, the mechanisms used to make their cars flip is visible on the underside of the vehicles. Filmmakers in that era installed compressed air cannons in stunt cars to make them flip during chase sequences. The mouths of those cannons can be seen when the cruisers go airborne.
(at around 1h 29 mins) 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.
(at around 1h 16 mins) 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.