The sound effect used when General Stevens looks on the radar screen to show the aircraft moving to bomb Garrison is the same effect used for the scanners in Aliens. See more...
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Factual error: The uniform the female soldier is wearing when she comes back home is all wrong: the camo pattern is that of the USMC digital desert uniform but it has "US ARMY" chest tags (in a strange size and position, by the way). The US flag and unit insignia are on the wrong arms. The cut of the jacket is ACU, the pants are true USMC.
Factual error: During the scene where the helicopter leaves the hospital roof, a Canadian registration number is visible under the front doors. An aircraft which operates solely within the US, which is what would almost definitely happen for a helicopter operating in a city in Colorado, would legally have to have a US registration due to cabotage laws concerning the registration of aircraft. AVPR was filmed in British Columbia, Canada, which explains a Canadian registration number, since all Canadian aircraft registration begin with "C".