When the Sheriff lists the damage Zack Carey has done to the town, he includes "one 1974 Chevrolet". When Carey destroyed the deputy's house, he actually flattened a 1973 Chevrolet.
After Zach enters the Outpost Cafe and takes a seat at the bar, the bartender removes the empty bottle and beer glass twice.
When Zak drives the tank past Sarah's trailer, Sarah is wearing a T-shirt. She grabs a pair of shorts and begins to put them on. When she exits her trailer, she's still in the process of putting the shorts on, but now, she's wearing a tanktop she hadn't been wearing before.
When Maj. Gen. V.E. Hubik tells the Sheriff that the Sergeant Major has resigned, this is incorrect. Enlisted personnel, including senior NCOs, cannot resign from the military. However, since the Sergeant Major most likely has at least 20 years of service the he can retire from active duty at any time. A General would have known the difference.
When the tank drives over the police cars at the roadblock, the front end of the tank raises up before it strikes the cars, exposing the fact that a small ramp was set up to aid the tank in climbing onto them.
When the tank drives towards the exit of the military base, you can see track marks on the road and in the grass from previous takes.
The newscaster says that the sheriff is deputizing two hundred men. Yet only about thirty men are with the sheriff.
During the tug-of-war scene, it never occurs to the sheriff's posse to simply unhook or sever the cable pulling the very tank they're trying to stop.
During the physical training scene, it starts at Kelly Hill, but they end up running past the general's house which is a distance of at least ten miles.
After Zack pulls up to the Sheriff's office with the tank, he asks the deputy where the Sheriff is. The deputy says that he is meeting with the Governor. Zack then destroys the telephone call boxes and the patrol car. In the next scene you see the Sheriff talking to the Governor telling him that Zack has destroyed his office, a patrol car, and so on. How would he have know that if no one could call and tell him?
When putting on the tank's thrown track on a Sherman, you do not push the iron bar in the opposite direction of its motion. You should stand in the other direction and pull it on.