Although the Civil War ended in 1865, and even with some time to get home and some time on the trail of his father's killers, the time couldn't be later than 1868. Several of the guns used are from a later period, 1870s, such as the Colt Peacemaker he uses and several of the rifles.
When Domino enters the bar, he stops to light a cigar, There is a woman in front of him at a table talking to some men, but her laughter and their conversation is not audible. Domino strikes a match against a pillar and that sound is heard loudly, even though it's further away,.
Wade Harrington claimed that part of Domino's ranch is public land so that Domino had no claim to it and couldn't use it, yet Wade built a dam on it. He was saying Domino can't use it because it's public land, but then he used it. Makes absolutely no sense.