Mark Hamill shows up as Laurie's new boyfriend.
In the episode the Partridges are filmed doing a song performed in their living room for an appearance on a television show. There are many grips manning equipment as well as "Hollywood" style canvas chairs. One chair has the name Fred Jackman, who was the director of photography for 92 of the series 96 episodes, including this one.
David Cassidy's voice is clearly dubbed by someone else in "They Say You Don't Believe in Love Songs".