On numerous occasions during the long Roulette game when the "No more bets" call is made, the wheel is shown to be turning pretty slowly; yet immediately afterwards as the ball is getting ready to drop into the slot, the wheel is suddenly turning much more rapidly.
Even though the setting of the film is established as the 1860s, everyone in this film are smoking machine made cigarettes (the cigarettes in this film clearly are NOT hand rolled cigarettes). BUT the cigarette making machine, which could make cigarettes in large quantities, was not invented until the 1880s, a couple of decades to come.