Continuity mistake: After speaking to Bill Graham in the tent Captain Willard comes back and tells the guys, "I negotiated two barrels of fuel for a couple of hours with the bunnies". As he walks back to the boat the hills in the distance can't be seen because of the rain but in the next shot when Chief Phillips comes over to talk to him the hills can be seen. (01:26:25)????
Continuity mistake: On the boat while Captain Willard reads Kurtz' file Clean starts making noise by tapping his drumsticks. This annoys the captain and as he gets up to confront him we see, at the right of the screen, the helmet that Clean is drumming on. In the next shot the helmet and its strap have been moved around the metal pole that holds up the roof. (01:19:05)????
Audio problem: On the boat while reading Kurtz' file Captain Willard narrates to himself, "dear son, I am afraid that both you and your mother well have been worried at not hearing from me during the past weeks, but my situation here has become a difficult one". At this point they show the actual letter that he's reading from and the text of the letter is not the same as what we are hearing. (01:20:40)????
Visible crew/equipment: On the boat while reading Kurtz' file Captain Willard recalls Harrison Ford saying, "and follow every order, however ridiculous" while having lunch with the general earlier in the movie. If you look at the close-up of his eye you can see a cameraman and another person's reflection as they stand in front of him. (01:18:35)????
Continuity mistake: Two other patrol boats pass them on the river going the other way and Chief Phillips yells over the megaphone "is that you Lazaro?". The guy whose pants fall down has a cigarette in his mouth, and his pants are down further in the front as the boats approach. In the next shot after they pass by, he has no cigarette in his mouth. (01:16:20)????
Continuity mistake: In a close-up Chief Phillips he says, "sampan off the port bow" and we see a kaki green T-shirt hanging next to him at the right of the screen. A couple of shots later Captain Willard says, "what up chief" and Phillips takes the T-shirt down. In the next wide shot of the boat the T-shirt is back. (01:34:15)????
Continuity mistake: As Chef tries to put the fire out with the fire extinguisher Captain Willard is hanging over the side of the boat with Clean as they try to escape the flames. In the next shot and as chief Phillips walks around him he's behind the helm of the boat near the Playboy picture that Chef taped up. (01:16:50)????
Continuity mistake: Captain Willard says, "the army tried one last time to bring him back into the fold" and we see a close-up of General Corman again sitting at lunch with the captain from earlier in the movie. This was not shot at the same time because the general's shirt is different. Look closely at his name, the collar covers everything except the first two letters whereas earlier in the movie, for the entire scene his name was showing and could be read. (01:18:10)????