Near the end, Lucille and Curtis are talking in front of the counter at the hardware store. In the wide shot, Lucille is facing Curtis. However, when the camera angle changes to a closer view, Lucille is instead facing the audience before turning to Curtis.
Lucy attaches file cards to the computer using magnets, which wipes out the inventory data. In reality, refrigerator magnets placed on the computer would not be strong enough to have caused any harm.