After one of the guests, Craig, shoots Hector and Armistice at the end of the saloon robbery, Armistice falls backwards on the ground and her hat falls off and rolls away. A minute later, as the guests look at Armistice laying on the ground, her hat is on her head.
When Armistice is shooting anything moving on the street, she begins with a lever-action 10-gauge shotgun. Bad editing changes this to a Winchester rifle.
During some of the scenes with milk bottles, while fairly resembling, Late-1800s milk bottles where stouter and rounder and more of the tin top variety. The actual props used resemble more mid-20th-Century bottle varieties. Other Late-1800s milk containers were tins, cans, and ceramic jugs.
In town, after The man in black speaks with Dolores he walks away. They each have two shadows.
When the Man in Black shot Teddy and started dragging Dolores to the barn, the camera catches close up of Teddy's pupil. Teddy's pupil showed the reflection of the Man in Black dragging Dolores and closing the barn door. However, this reflection is not left-right flipped image of the view while it should have been if it were true reflection.