Mel Stewart is an accomplished saxophonist. His character, Billy Melrose, had an undercover name Billy Blue Note, who plays the saxophone. He got to show off some of his skills in this episode.
Marvelous Marvin's shows up again. It was the target of corporate espionage in Season 3 Episode 12 Fast food for thought. This time the boy Amanda and Lee are investigating is the victim of an attempted kidnapping at a Marvelous Marvin's stand.