Revealing mistake: When Col. Tanner is on top of the Russian tank, he is firing his pistol into it. After a few shots, you can see that the slide on his gun locks back, showing that the gun is empty. Tanner does not reload, but is none the less able to keep shooting afterwards. (01:11:25)
Revealing mistake: In the beginning of the movie, when the teacher is shot, the impacts on his chest are out of sync with the actual gunfire. First, we see the soldier start shooting, but he fires several shots at point blank range before the bulletholes and blood appear on the teacher. Also, as the angle changes, the teacher falls backwards with more impacts appearing on his chest. The problem is, the soldier has already stopped shooting, and there is no other gunfire to be heard. (00:05:25)
Revealing mistake: Early in the film, when the boys shoot the deer - there is no actual shot that comes out of the shotgun. He pulls the gun back, simulating a shot, and the Sound FX is perfectly placed, but there is no shot coming out of that gun.
Chosen answer: I was one of the actual paratroopers in the movie. There were at least two different companies providing the extra's. The company that provided the actual paratroopers was Delta Productions, Inc. owned by John Early who owned the Parachute Center in Albuquerque, NM. John was a former Green Beret and professional soldier and was hired to be the technical adviser to the film. As far as I know, Delta Productions is no longer in business. The other company that hired extras provided the non-paratrooper extras. I do not have any information concerning that company but I do know that most were locals who lived in Las Vegas, NM. I know this because I met one of them in the Marine Corps years later. To answer your actual question, I have no knowledge if that information was kept other than those companies that hired them.