The Sheriff of Santa Rosa - S1-E23
Other mistake: Gene is chasing Ted Nolan, who is believed to have ties to a gang of cattle rustlers. Both men are on horseback. A long shot of Gene riding across a range is followed by a long shot of Ted riding across the same range so it appears Ted is chasing Gene instead of the other way around.
Audio problem: When Blanche discusses Mrs. Somhers coming to visit from California, she says a line about her in the kitchen. When the shot switches to the entrance to the living room, Blanche repeats the same line.