Other mistake: On the way to fort Henry Magua starts his attack by hitting a soldier with his axe. Before being hit the soldier smiles into the camera (seen through Magua's eyes), but doesn't even look when he is being hit, seen from the side. (00:17:10)
Other mistake: In the final scene, just after the death of Magua, you can hear a small dog (perhaps one owned by a cast, or crew member, but unlikely to be a breed out in the wilderness away from human shelter) barking. (01:46:20)
Suggested correction: Laughable. There is no audible barking of a dog.
Other mistake: When Hawkeye, Uncas, and Chingachgook jumped through the waterfall, their gunpowder was, according to Hawkeye, soaking wet. When escaping from the Huron camp, Hawkeye suddenly has dry powder to put the burning British officer out of his misery. Nowhere do we see our three heroes get dry powder. And no, sodden gunpowder can't be dried out and reused.