One of the very few episodes of Columbo in which the Lieutenant appears on screen before the murder takes place.
The ship where this was filmed was called the Sun Princess at the time. It was later sold many times and renamed Ocean Dream. It was abandoned off the coast of Thailand on February 27, 2016 and sank. It remains on its side off Laem Chebang Port.
The magician's box of props is labeled with the name of the actor playing the magician, Curtis Credel.
The woman who calls out to Robert Vaughn's character on the sun/pool deck (something about margaritas) was Peter Falk's personal assistant.
Although Columbo is on "the ship" with his wife, she is never actually seen by the viewer, though some of the ship's crew do mention seeing her.