Continuity mistake: In the scene where the future Ghoul Gang shares the booty, Amsterdam provokes the leader who is sitting down while the others are standing behind the table. The guy jumps at him, while the others stay where they are, but before he reaches Amsterdam the others guys separate them, emerging mysteriously from the sides. (00:30:20)NancyFelix
Factual error: The lords are playing Snooker in a scene. This movie is set in 1862. Snooker was not invented till 1875.
Other mistake: In the scene where Jenny is showing Amsterdam the advertisement for the ship (the Commodore) leaving for San Francisco, the movie makers made a misprint on the card. On the sail of the ship it says "Randolph M. Cooley - 118 Wall St". In the low right corner of the card, the address is "Randolph M. Cooley - 118 Water St. - Cor. Wall" (corner of Wall St.). (01:49:00)