Corrected entry: The kid that Peterson takes under his wing calls him "Peter San." That's Japanese, not Vietnamese.
Corrected entry: When Sgt. Peterson scrounges a .50 caliber M2 heavy machine gun, we see it set up in a sand-bagged emplacement. However, the linked belt of .50 caliber rounds is shown hanging down the right side of the weapon. The M2 feeds rounds in from the left and ejects empty cases and links out to the right.
Corrected entry: In the scene where John Wayne smashes his dead soldier's M16 into a tree, he does the impossible. The M16 buttstock is made of a high quality plastic fiber and is impossible to smash in such a manner.
Corrected entry: Having finished the kidnap mission, Peterson volunteers to take the point. But just before he triggers the trap we see him walking with his gear casually slung over his shoulder. The lead scout's job is to scan the area for such things.
Corrected entry: Paratroopers attach a 'static line' to a cable inside the aircraft before jumping from the aircraft. This releases the parachute from a deployment bag strapped to the parachutist's back. During the movie scene where John Wayne and his soldiers parachute into enemy territory, John Wayne's static line is draped over his shoulder.