Revealing mistake: The scene right after Mrs. Moore delivers the first batch of telegrams shows Lt. Col. Moore kneeling beside several "dead" soldiers. I could see at least the first four breathing.
Revealing mistake: Snake Shit's helicopter has no holes in its windshield. Every other part of the helicopter is riddled with bullet holes except his perfect, spotless windshield.
Revealing mistake: Towards the end of the movie, a VC soldier holds a shoulder fired rocket launcher. If you watch carefully, you can see the rocket wobbling as if it's made of rubber.