George Herbert carries a black backpack, which mysteriously appears and disappears through out the movie.
The army sgt is wearing Marine Corps sergeant chevrons and there is no unit patch or name tape on his uniform as there should be.
George Herbert uses a rabies serum to knock out the aliens. He says something to the effect that life defeats life. However rabies vaccinations use dead virus cells to generate immunity. Serum labeled "live" contains genetically modified components but does not actually contain intact live virus.
An Army soldier at the bridge is wearing a white shirt underneath his BDU blouse; it should be brown.
Gary Busey is a second lieutenant. No officer wears shiny bright bars on camouflage. He would be wearing subdued black insignia.
When it shows George going down a creek in a small boat the letters should be Va for Virginia, not Cf.
The credits refer to the "Hopetown Mayor", but the town's name in the movie, and the real New Jersey town, is Hopewell.