Continuity mistake: The Frenchmen with the accordion asks Captain Willard, "Do you know anything about Dien Bien Phu?". If you look closely at the doors in the other room, most of the lower shutters are closed. The next time we see them all as the Frenchman playing the accordion stands behind the captain and says, "Dien Bien Phu, okay" all the shutters are open even though no one goes near them. (02:08:30 - 02:10:00)????
Continuity mistake: Just as the rocket attack starts on the boat Chef is reading his mail and says, "hey Lance ". Look closely at the bullets on the machine gun right behind him, they're all draped to the left of the gun, no one has touched them but in a previous shot they were draped to the right the gun. The M-16 has also been moved. (01:51:40)????
Continuity mistake: The old gentleman sitting across the table from Hubert de Marais says, "Maybe in the future we can make something with the Vietminh" and the gentleman to the left of Roxanne replies, "Don't you understand". If you look closely the cigar that he just put into the ashtray in the previous shot, along with its smoke, has disappeared. (02:07:00)????
Continuity mistake: As they depart from the USO show at Hau Phat Chef shows everyone his picture of Miss December and there's a helmet hanging on a poll in the rear of the boat with the top facing Chief Phillips. Each time we see this helmet in the next few shots it moves sometimes facing the back of the boat and sometimes facing the front. (01:11:55)????
Continuity mistake: As they approached the French plantation there are two distinct shots of this area, one is from further back then ten seconds later there's a close-up. The clouds in the background are entirely different in these two shots and the clouds change again when the Frenchmen show up. (01:55:50 - 01:59:20)????
Continuity mistake: Chief Phillips says, "Lance take a 16 on the bow" and we see him walk to the front of the boat past the spot we're Captain Willard was hiding for cover during the attack that killed Clean. The molding was blown off by machine gun fire during the attack but now it's good as new. (01:55:30)????
Continuity mistake: There have been many shots of the surfboards as they flew to Vin Din Dop and they were all on the skids of the helicopters, now when Colonel Kilgore says, "do you wanna surf, soldier" we see the surfboards placed next to each lengthwise through the helicopter with their fins sticking out the side doors. (00:46:05)????
Continuity mistake: As Roxanne unties the curtains around the bed the scarves draped over the light on the left of Captain Willard are not the same ones we just saw in a previous shot as the captain took a smoke from the pipe. The ones before were red and yellow but now the middle one is primarily green. (02:19:05)????