When Judge Goodnight is preparing to play poker with Col. Knox, he sets his shot of whiskey down on the table. When the camera angle changes, he sets it down again.
When Goodnight prepares to play poker with Col. Knox, he walks up to the table and begins to sit, but pauses half way down and asks if he can join the Col. When the camera angle changes, he begins to sit down and pauses half way again.
During the scene when Luke Perry's character first sees the stage coach and begins his chase, there are modern hydro lines and poles (tall steel ones) clearly visible in the upper right hand corner.