Continuity mistake: When they are dancing the king's earring is on his left ear then it somehow jumps across to the other ear.
Visible crew/equipment: In the scene where George takes Samantha into the lounge room to lie down, as she reclines on the lounge you see the shadow of the boom microphone on the ceiling moving.
Continuity mistake: The opening scene states the date as April 10th 1865, the day of the train station robbery. Siringo tells Vance at the school money-raising event that the robbery took place 8 weeks ago, but when Clint is buried at the end, his death is April 25th 1865, only 2 weeks after the robbery.