This episode marks a return of the Stay Puft Marshmallow Man, one of the few spirits to make more than one appearance in the show.
This is the first episode in which Stay Puft speaks (aside from grunts). He has a large number of lines and cogent sentence structure in this episode.
The buffoonish hotelier, Mr. Plump, and his hotel, Plump Towers, is a clear reference to Donald Trump and Trump Towers.
In the September 10, 1986 script only, the Firehouse scene also included the Ghostbusters playing Monotony, a game similar to Monopoly.
In the September 10, 1986 script only, there was a request from room 1302: a live chicken to be used for a religious ceremony.