In one of the lab scenes, Dr. Watts becomes excited because the lab specimen he's examining is smaller than it was. He asks for another slide of the same sample, but when he looks at that sample he's excited because it's bigger than all the others.
At around the 53 minute mark, two jeeps cross a small stream in a field. There's a slight hitch between when the first and second jeep cross, and when the camera pans, the first jeep is much farther ahead of the second than it was before, suggesting that a section of film is missing.
Watch closely. When Clank, who obviously has the disease, is holding off the white-suited soldiers, his carbine runs out of ammunition. He pulls a pistol, a colt 45 and kills one more soldier with it. After he tosses it down next to his empty Carbine, it turns into what appears to be 9mm Browning pistol.
In the opening scene, Judy gets out of bed naked and walks to her dresser to get clothes. She starts putting on a bra, but panties simply appear on her between shots.
When talking on a field radio while working in the high school science lab, Dr. Watts talks without pressing down the "talk" button on the radio's handset. The person he's talking to wouldn't be able to hear him unless he pushed the button, yet the conversation continues.
It is stated repeatedly that the pathogen is a virus, but several references are made to it being a "bacteriological" weapon, as if viral infections and bacterial infections are the same thing. The female lead also takes an antibiotic that slows her response to the pathogen, but antibiotics are for bacteria and wouldn't help against a virus.
When the government suits are arguing about getting a member of the Trixie team into into the town one of them demands that a plane be sent and waiting at Fort Detrick to pick up the first one to arrive. However Fort Detrick is only equipped with landing pads for helicopters. There is no on site runway so a plane landing or taking off from the actual base would be impossible.
Early in the film, when Judy arrives at the Doctor's Office, a military doctor wearing a gas mask is working on the previously burned boy. When he speaks, his voice is clear with no muffling that would result from wearing a gas mask.
During several of the "night" shots, it is clearly day with a dark filter on the camera. At times it is possible to see the sun's reflection on objects.
When Judy and company are being hunted by helicopter, the two men are shooting their M2 Carbines straight up, which is how one would shoot down a helicopter. BUT, when the helicopter returns fire, the impacts in the trees are coming from a ground level trajectory, not down at an angle, which, if the helicopter were firing, is the way they'd hit.
Early in the movie when the military, clad in white bio hazard suits and masks, one of the mentions that ultraviolet and gas masks aren't necessary. So why are the soldiers still wearing them? Also, later on the 'scientist' says ultraviolet can kill the virus. So what is it? Does ultra violet work or doesn't it? As for the soldiers, this film had a very low budget and keeping their faces covered meant the same few actors or stunt men could play the soldiers over and over.
When David pulls a gas mask partway over his face to disguise his voice and fool one of the soldiers, the words he says don't match the movements of his jaw.
Had the army posted a guard outside the room Dr. Watts was working in to protect him from the diseased and given him someone to immediately report to if he found something (or just given their only hope at finding a cure his own radio), he would never have been mistaken for one of the diseased and they would have found the cure.