Other mistake: Pat, riding a wagon pulled by two horses and headed to Rock River, slows to look at a sign. The sign, shown in close-up, says "ROCK RIVER, 5 MI." An arrow points to the right - but that is the direction Pat is coming from. The arrow should be pointing to the left.
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.