Continuity mistake: Throughout the film, Maj. Casey Schuler's hair is dyed strawberry blonde. In the scene where he convulses from being infected with the virus and is rushed to an available hospital bed, his hair color changes to his natural dark locks. In his death scene a few minutes later, his hair color is back to being strawberry blonde.
Continuity mistake: The bomber approaching the town is military green in all scenes but one. One shot, however, is of a bright yellow plane. If that's just the sunlight, then note that a minute and a half later, the plane (which has supposedly been approaching from the same direction) now has sun shining on its right side rather than left.