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.
Other mistake: During the opening sequence there is a shot of a muddy river where we are shown the credits for Director of Photography, Camera, Sound, Film Editor etc. When "Camera" is credited there is a number 2 next to it, that is the order in which the credit appears, but none of the other credits are numbered. (00:06:20)
Suggested correction: That's not a mistake. Fransisco Joán and Orlando Macchiavello were second cinematographers (2. Kamera in the original German film credits).