Factual error: The slave ship the pirates overtake in the beginning is flying the tricolor flag of modern France, which was not adopted until the revolution in 1789. Blackbeard is set in 1717.
Factual error: The British Naval uniforms worn in this film, set in 1717, are more than 50 years out-of-period. The costumes were styled after uniforms that were not in use until after 1770.