Continuity mistake: As the boat leaves the USO show at Hau Phat Captain Willard says, "The war was being run by a bunch of four star clowns who were gonna end up giving the whole circus away". He says this as he walks to the back of the boat moving the 60 caliber machine gun on his way so that is faces frontward. In the next shot it's been moved and is now facing sideways.
Continuity mistake: Watching the USO show, Clean and Chef start out on the right of the stage with a still photographer and press reporters, who are sitting behind a desk. Later in a rear close-up of playmate Carrie Foster we see the entire right side of the stage but there is no press desk.
01:07:25 - 01:09:00????
Continuity mistake: As Captain Willard arrives to kill him, Colonel Kurtz stands in the doorway looking at the tribal festival and it's not raining, but in the next shot of the Captain, with the festival in his background, it is now raining. Finally, in the next shot, as the Captain runs to the doorway, it is again no longer raining.
Continuity mistake: Before they arrive at the French plantation there's a shot of the back of the boat with Clean's dead body lying there. If you look closely the blood splatter is entirely different from the shot when Chief Phillips turns around and first sees that Clean's been killed. The two main differences are that at this point there's blood on the rear machine gun where there wasn't any before, and there's no blood on the right of the V shaped support bar of the 60-caliber machine gun where it had been covered prior.
Continuity mistake: As Chef and Captain Willard are walking through the jungle looking for mangos Chef says," I was supposed to go to Paris" as he's walking over the roots of a huge tree. He continues talking but in the next shot he's out in the open, nowhere near the roots of that tree.
Continuity mistake: Just before Colonel Kurtz falls to the ground we catch a glimpse of him with blood running from the top of his head down the right side of his face. Several seconds later as the lies on the ground dying there are only a few small drops of blood on the right side of his face.
Continuity mistake: Dennis Hopper holds his cigarette between the first and second finger of his left hand before he gives the water to Captain Willard in the bamboo cage. In the next shot as he gives him the water the cigarette is between his thumb and first finger. Then in the shot after that it's between his first and second finger again.