When Stacey goes to Susan's apartment at the beginning of the film, he takes off a light-colored scarf. When he goes to leave, he puts on a much different and dark-colored scarf.
When Bette Davis first served coffee (to the sleeping Jim Davis), she drank out of the nearest cup while she waited for him to wake up. After he did, she handed him the same cup she had been drinking out of instead of the other.