A woman falls from a horse face first, but is shown laying on her back in the next shot.
When a man is beaten up to death in woods, his wound shown from the side doesn't match one when he is shown from the top.
A man ties woman's neck with a rope and then waves her around and slams her on a tree killing her. It would take an insane amount of strength to do something like this the way it was shown and the use of CGI is obvious.
A man rips another man's hand off with a hook attached to a lasso/whip. That's highly unrealistic and would take an insane amount of strength to do.
Kit kills a man by stabbing his eyes with a horseshoe, something that would be extremely hard to pull of and would require an insane force to be done like it's shown in the movie.
Trish kills a man in the barn, but he is clearly moving after being dead.
After a man with a branding iron appears and chases Kit, there is a clear green light from the camera in the shot with the saw hanging.
The Rodeo Clown's origin and motivation are never explained, even though he is relevant to the plot and helps some of the characters.