When Boone and Gabe are putting up the fence, the top rail disappears and reappears between shots.
Mason Pruitt and Amy are having a discussion in their cabin about whether Mason should go after Hanker and Smith. Despite Mason and Amy only being engaged it appears that they are already living together under the same roof. A man and a woman who were not married living together would not have been tolerated in that day and time and not for many, many years to come.