Factual error: When Michael Vronsky gets back from his tour he has a full grown beard. The only branch of the service that allows a beard is the Navy, and he was an Army Green Beret. The beard would only have been tolerated if Mike was either not in his Class A uniform or actively performing on a mission, neither of which are the case here. In addition, he's wearing a Black Beret, but his left shoulder patch is the 101st airborne, not Special Forces. Finally, he has six or seven hash marks on his right sleeve. Each hashtag is for 3 years of active duty service.
Trivia: During the helicopter stunt, the runners caught on the ropes of the suspension bridge and as the helicopter rose, it threatened to seriously injure both Robert De Niro and John Savage. The actors gestured and yelled furiously to the crew in the helicopter to warn them. Footage of this is included in the film.