At the time of original broadcast, Dick Van Dyke was the spokesman for Kodak Instamatic (110 size film) cameras in a series of TV and print ads.
When Galesko and his publisher are at the gallery exhibition, they both say "Hi, Phil" to an unseen figure off camera. Phil Cook was the First Assistant Director on this episode.
Columbo tells the nun he had owned his coat for seven years. That means that the coat was at least three years old when we first see Columbo in the series debut.
Joyce Van Patten plays a nun who mistakes Lt. Columbo for a homeless person and tries to find him a new coat. She plays the cold murderess, Ruth Lytton, in Old Fashioned Murder (1976).
Paul Galesko's distinctive fireplace fan in this episode is also in Nelson Heyward's house in Candidate for Crime (1973).