One of the very few "Columbo" cases where the viewer does not know the identity of the killer until Columbo reveals it at the conclusion.
Julie Newmar's phone in her apartment is identical to the red "bat phone" from her Catwoman days in Batman (1966).
At the bank, Columbo says that he is nervous being around so much cash. The $554,000 would be equivalent to about $3,998,000 in 2024 after adjusting for inflation.
Dabney Coleman made two appearances on Columbo. Here he plays a detective, and in Columbo and the Murder of a Rock Star (1991) he is Columbo's adversary.