Mabel, a woman living in 1876 in the American West, has shaved armpits.
The film opens and ends in a cave/old gold mine with a flat floor, perpendicular/vertical walls, and NO wood bracing.
No real cave or gold mine is that precise, only on movie sets.
The film was shot in Hungry, so maybe it's a Hungarian salt mine. maybe the Hungarian set builders built what they were familiar with.
At 45 minutes 42 seconds a jet stream is seen in the sky, the upper left quadrant of the screen.
Jeanne offers the marshals "Morgan silver". The film is set in 1876. The Morgan silver dollar wasn't issued till 1878.
A marshal takes a leak in the bushes, then zips up (we hear the zip). The film is set in 1876, Zippers weren't used in clothing until 1901. In 1876 we still used buttons on our flies.
When they're in Butterfield's hotel Roy rips the "No Colored" sign down with his left hand and the next scene his avatar slams it on the counter with her right hand as if done in one swift move and no time to switch hands.