Hardy states that he will go to the indian camp unarmed. While riding his horse to the camp you see he has his gun on his left hip, then in the next scene the holster and handgun is gone.
At the very beginning of this episode Jim Hardy is relating how Wells Fargo must deal with Indians as they build roads thru the west. While he is narrating, the usual steam locomotive is shown chugging down the tracks. And then it passes a bulldozer.