Factual error: The Liberty Bell is depicted ringing as the Declaration of Independence is being signed on July 4 (a mistake itself) in the film. The bell actually did not ring on that date, but on July 8, when the Declaration had been returned from the printer and unveiled to the public.
Visible crew/equipment: In the film's final moments, as the camera revolves around the raft, you can see the wake made by the camera boat on the river's surface. (01:32:49)