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: Near the end of the film, just after one of the soldiers is hit in the chest with a spear and falls overboard, there is a shot of another soldier (who is missing teeth) lying dead on the raft. If you look in the top left corner of the shot you can see the foot of a crew member wearing a modern trainer shoe. (01:22:42)