Visible crew/equipment: At the surrender of the fort, as the English are marching out, the French general removers his hat. The English Commander, Monroe, says "The fort is yours, Monsieur". Look over his shoulder. In the distant valley you can see what are either two tourist busses or perhaps mobile catering vans.
Revealing: Near the very end of the movie, when Magua has taken Uncas' love interest (Madeleine Stowe's character's sister) and he is taking a path through the mountain, Daniel Day-Lewis runs up a path and brushes against what seems to be a rock. But, the grey coloured "rock" seems to be a prop and moves like a piece of cloth.
Visible crew/equipment: As the English are leaving the fort, if you look right after that between the soldiers and down toward the beach, you'll see what looks like a blue and white umbrella where someone is sunning themselves by the lake.
Continuity: When Daniel Day Lewis, his brother and father are going after the Monro girls and the officer, in one scene where the dark haired Monro girl falls against a bush and breaks the branches. If you look closely at the scene before, the branches are already broken.
Visible crew/equipment: In the hunting scene at the beginning, you can see a man with a red cap on the right side of the screen, above the running deer.
Factual error: During the battle over the fort the British shoot a red flare into the sky. The British army learnt of the effectiveness of rocket weapons when fighting in India in the 1790s. In 1804, rockets (developed by Colonel William Congreve) were introduced into British service. The rocket flare was developed around this time (also by Colonel Congreve). This film is set in the 1750s - the British army would not have had rocket flares (source: Taylor, J.W.R (1970). Rockets & Missiles, Hamlyn, London. PP. 6-10).
Visible crew/equipment: At the begining of the scene where the evicted fort dwellers are making their way through the forest, as the column moves away from the camera, a crew member with a red baseball cap and a megaphone comes into shot.
Visible crew/equipment: When the people are all marched out of the fort, in the lower right hand corner there is a guy wearing a blue baseball hat.
Continuity: At the dinner at the Camerons' lodge Mrs. Cameron's bangs change from shot to shot.
Continuity: After the fight on the way to Fort Henry Duncan's temple curls disappear.
Continuity: When Duncan tries to explain his version of the raid of the Camerons' lodge to Cora part of his uniform is a read seat-belt-like piece of cloth. This wasn't there in the scene preceding imediately.
Continuity: When Duncan lies to Munro about the raid of the Camerons' lodge Cora's hair is totally dishevelled. Immediately after that when Duncan tries to explain it's nicely done.
Continuity: During the walk to Fort William Henry, at one point, Uncas, the true Mohican son, turns to look at Alice who is struggling and his earring is in his right ear. During the rest of the movie, the earring is in the left ear.
Audio problem: During the ambush of the British troop, as some of the soldiers take their first aim, it cuts to some Hurons running downhill. If you look in the lower left corner of the screen you can see a Huron firing without us hearing it.
Revealing: After they leave the fort, in the forest glade when the Huron start hollering, the air above the soldiers is very clear. But in the next shot just when the guns start to fire, there is a smoky haze hanging over the forest. Apparently the first attempt to film this scene didn't make it to film and some of the residual smoke was still there when they filmed it the second time.
Factual error: When Hawkeye shoots the elk in the opening his rifle emits a muzzleblast, but the priming powder in the pan does not leave its characteristic smoke. When a flintlock is fired two distinct clouds of powder smoke should be seen.
Continuity: During the battle over the fort the protagonists' group approaches the fort by canoe, with the women sitting in the canoe and the men guiding it wading through the water. In the shots showing Cora's face Alice is not in the canoe.
Continuity: When Magua is leading the troop into the ambush he turns around and walks towards the troop. When it cuts to a shot behind him we see him lifting up his right arm. When it cuts his arm is down.
Continuity: During the scene at General Webb's office things on the desk appear and disappear and change places, like a glass, a water bottle, a candle, etc.
Deliberate "mistake": Rhododendrons, visible in the opening scene and mentioned specifically in the shooting script, do not grow in the Adirondacks.