During the close-ups of the judge’s boot—the first time, before he shoots the hangman, the boot’s are dirty. But when he rides to the McCain ranch, they're clean. Thanks Ann Marie!
After the cow moos to let Lucas know her calf got stuck, look at the fence. The sun is shining on the part of the fence to our left. It is dark behind both cows. But when Lucas goes into the corral to get the calf—the sun has moved a bunch, causing the reverse effect, i.e. fence is light behind the cows and dark to the left. Thanks Ann Marie!