Goofs

When the Doctor is examining the teenager's dead body, his tie changes position.

After Sheila and the Sheriff are attacked by the bats in the car, they get out and Sheila closes the car door. In the next shot the door is open.

When the Sheriff is smoking on the bridge, the position of the cigar is constantly changing.

Jumper cables connected to a chain link fence will short out as soon as the power is turned on. It will not electrify the fence.

In the autopsy scene, Dr Casper removes a bat tooth from the body of one of the teens killed in the opening scene, and says it is from a Pteropus species. Dr McCabe confirms that he had been experimenting on Pteropus poliocephalus in Indonesia. However, Pteropus poliocephalus (grey-headed flying foxes) are a type of megabat found only in southeast Australia, not Indonesia, and they look very different to the bats seen throughout the film, which are clearly some kind of microbat.

McCabe does mention that he genetically modified the original bats using a virus, which has since spread to other bats, so in theory it could be that the teens in the opening scene were killed by flying foxes from the original experiment group, while all other deaths in the film were caused by some other species of local bat which had since become infected. However, if this were the case, this would imply there are at least two separate populations of bat which the characters would need to destroy in order to stop the attacks (there do not seem to be any flying foxes mingled with the microbats at the big roost at the film's climax), and none of the characters suggest this as a possibility.

The military officer told Sheriff Emmett Kimsey that the fighter jets are going to bomb the area in 62 minutes. It was shown and can be assumed that the jets have already been airborne for the said destination. The maximum speed of a fighter jet is said to be 4520 Miles per hour or some 7274 Kilometer per hour. With that speed, a fighter jet would have covered more distance than the entire length and breadth of the country, so why would the officer give 62 minutes to them, unless he has for some reasons asked the jets to fly at much lesser speeds.

Dr. Casper fires 7 rounds out of a revolver which holds but 6.

Dead deputy found in bar can be seen breathing.

Laser and inkjet printers do not make the noise of a noisy dot matrix printer.

The government decided to send fighter jets to bomb the mines. They didn't tell anyone or made any announcement so that any local people who are near the location can go away for safety. They only told Sheriff Emmett Kimsey on the phone or walkie-talkie. That is not the way an inland bombing is done in any country.