When Gus rescues Lorena from the gang of Indians, she has a deep cut on the right side of her lower lip. When they return to the cattle herd, her cut is completely healed, with no trace of a scar.
Capt. Call's horse is named Hell Bitch and referred to with female pronouns through the entire series in spite of the fact that the horse is quite clearly a gelding (castrated male).
The town Ogallala is spelled Ogalalla and Ogallala on different signs. The first spelling is the correct one.