When Kelly is telling Mrs Jamison about the dog cutting the telephone wires, Gloria is holding onto Mrs Jamison's arms. In the immediate next shot, Gloria's arms are by her side.
When Gloria says that Harrison liked coffee, she has two hands holding the cup. In the next longer shot, only one of her hands holds the cup and it is held lower down.
During the basement entry of the old lady, a candle "illumination" suddenly lights up room with the loud click of an arc light turning on.
Camera shadow on the side of the large table during the opening tracking shot of the tavern's main room.
The person unmasked as the killer was on the other side of the lobby from the sites of the first and third murders when they took place.