There is one scene where two Moe Szyslaks are shown at the same time.
When Marge is talking to her guests as they prepare to leave and as they begin singing Christmas carols, she is standing next to the couch in the living room and there is a wall a few feet behind her with a plant in a cubbyhole. In the close-up shots of her, she is standing in the sitting room in front of the archway leading to the living room. The couch and the two lamps can be seen behind her in those close-up shots.
Reverend Lovejoy is shown alternately with and without a watch while he is typing his sermon.
Gloria's Daughter was seen coloring a picture with Dakota, but in the next scene, was seen wearing her regular clothes, in the Cootie Quarantine with a few other girls.