When the Rev. Sloan is comforting Claudia and unbuttons her blouse, it is obvious that her skirt has a zipper. The movie takes place in 1908, but the modern zipper that would be used on clothing wasn't designed until 1913 and patented in 1917.
In the opening scene, Hogue confronts a Gila monster. In the first shot, the lizard is on a large rock with its front left paw slipping over the side of the rock. After cutting to a shot of Hogue, the view returns to the gila monster who is now standing in the middle of the same rock with no time or ability to have moved.