The brim on Wes Rawlins' hat curls up and down at various times.
The hats basically all stayed new and unblemished, except for the "bounty hunter", Kevin Sorbo's long lost son. Looked like they just came out of the box.
(at around 49 mins) There is a shot of cows in a meadow. Behind the cows there seems to be a white weather vane in the distance.
When Rosalie Eastman rides in and meets Wes Rawlins she tells the hands that it is late in the day and to put up Rawlins for the night. However, the shadows around the characters indicate that it is close to high noon.
The structure at about 49 minutes looks exactly like a modern wind turbine. The "tin" cans used as target practice are not of the period. The ribbing on the cans looks current.
The moon stayed "full" for 3 or 4 days, with no change in the slightly dim edge on the lower left side. This is an astronomical impossibility.