Walter Peck (the bureaucratic antagonist from the original film) returns in this film to seek revenge on the Ghostbusters for humiliating him. This is the only appearance of Peck in the series.
In this episode, it is revealed that the Ghost Traps can be held in the hand too, but the person has to look away like in both Ghostbusters movies.
While searching Testing Lab 5, Ray uses a device referred to as the Specter Detector. It looks like the Ghost Sniffer from the first movie.
Ghosts can't go through lead.
The voice actors were recorded on June 1, 1987.