Corrected entry: In northern South Vietnam (now central Vietnam), there are no navigable rivers that lead into Cambodia.
Corrected entry: There's a shot of a jet crashed in the mud on the shore of the Nung River in a classic scene as the PBR sails underneath it. This makes for a great shot and may be the way WWII airplanes crashed, but it's not the way B52's crash. At the rates of speed and high altitudes they fly a jet aiming down at the ground like that would be in a million pieces and not sticking up in the mud. Even if the tail section were blown off it wouldn't crash this way and that's why there are absolutely no pictures of a Viet Nam combat era B52's tail section that has crashed in this way.
Corrected entry: Captain Willard says, "the VC knew his name by now and they were scared of him" as he marks his destination with an arrow on his map of the Vietnamese Cambodian border. The spot that he marks on this map is wrong because the boat follows the Nung River all the way to his destination at Kurtz' camp and there's no river anywhere near the spot he marks on this map.
Corrected entry: On the morning after the USO show, a helicopter is shown hovering above and behind the bleachers. The helicopter is an OH-58 Kiowa. This helicopter was not used in Vietnam during that time.
Corrected entry: Willard is tearing the confidential mission paper into large pieces and throws them into the river. The pieces are large enough to reveal a lot of information or to be easily pieced together if picked up. The proper way to dispose of secret information would be to burn the pieces of paper.Airborne Ranger
Corrected entry: Willard is fully decked out with American gear and weaponry. This should not have been allowed; American personnel operating covertly in Laos and Cambodia were carefully re-equipped with enemy, untraceable, or foreign weapons (e.g. the Swedish K submachine gun) and clothing. If they were captured or killed, the USA could then deny any knowledge of these technically illegal missions - much harder to do if they're sporting an army-issue M16 and regulation clothing.
Corrected entry: When the PBR arrives at the supply station during a torrential downpour, there are several dry gaps where no rain is falling - a dead giveaway of a rain machine.
Corrected entry: During the scene where the PBR crew shoots up the Sampan, Clean's M-60 machine gun is loaded with blanks. The tips of the linked cartridges being fed into the gun are red, in other words not live rounds. It was mentioned that red tipped rounds are red 7.62 tracer rounds, but no ammo feed would consist entirely of tracers - they're only ever every 3 or 4 rounds.
Corrected entry: When the air cav attacks the village, one of the huts is flying a North Vietnamese flag, yet they are in South Vietnam, and the Viet Cong wouldn't be dumb enough to fly the 'enemy' flag where everyone can see it.