This marked the first time, including the characters' respective book series, that the Hardy Boys and Nancy Drew had a crossover. However, in later years this would become a frequent occurrence.
The first song performed by Paul Williams in this episode, "The Hell of It", is also performed by him in 'Phantom of the Paradise (1974)'. At the end of the song, Williams dons a set of fake teeth that makes him look like the Phantom of the Opera, the character parodied by him in the movie.