Character mistake: When Vallian prepares to leave the homestead, McKaskell asks him how his chest wound was. Vallian was shot low on the right side, just above the gun-belt, and McKaskell, who removed the bullet, was quite aware of the location.
Visible crew/equipment: When Caleb punches the driver guy in the bar, the guy (who has now been replaced by a stuntman) goes flying backwards and lands on the pool table. When this happens, a wire can be seen on the stuntman, pulling him back and guiding his movement.