Rosanna Huffman, who portrays Dale Kingston's (Ross Martin) girlfriend, Tracy O'Connor, is the wife of series co-creator and writer of this episode, Richard Levinson.
The barely-glimpsed actor playing Dale Kingston's uncle is B-movie icon Robert Shayne, who played Inspector Henderson on Adventures of Superman (1952).
The nighttime exterior shot of the apartment of art critic Dale Kingston visited by Columbo was 882 N. Doheny where Marilyn Monroe lived twice in 1953 and 1961.
The $2,000 annual inheritance to the Evans couple would be equivalent to $14,253 in 2023.