When fighting in the King's chamber, the nobleman falls between Kidd and the table. In a shot soon after, Kidd stands between the nobleman (still on the floor) and the table.
When Lady Anne drops her bag before leaving the treasure ship, it is returned to her right hand. In the next longer shot, the bag is now in her left hand.
Sailors (who were unlikely to wear shoes on ships anyway) would never wear shoes into a powder magazine. The chances of a spark from boot/ shoe nails amid all that powder was too great.
When firing ships' cannons, gun crews would use a slow match, not a flaming brand.
Many facts about Captain Kidd's life were altered to fit the dramatic narrative.
Kidd and some of his men go in to a cave to bury a treasure chest. After the hole is dug, Kidd kills a man and buries him with the chest. Later, Kidd returns and digs the chest up. The man's skull is revealed and is completely devoid of any flesh. But then the chest is uncovered and the wood of the chest (including the placard with the name of the ship: The Twelve Apostles) is just as pristine as when it was buried. A most unusual cave, where flesh rots but preserves wood? But then the flow of the film would have been disrupted if the treasure was loose in the muck.
The London scenes show Tower Bridge, which didn't begin construction until the 1880s.