In addition to changes in voice talent, several of the major characters undergo serious changes in appearance, beginning with this episode. Janine is given softer facial characteristics and Ray is significantly slimmer than in previous episodes. Although it does not appear in a pronounced way in this episode, Slimer now has a tail throughout the rest of the series. Slimer is more obedient and less menacing and Peter gets along with him better.
The voice actors were recorded on May 13, 14, and 15, 1987. Frank Welker recorded on May 14 and 15, 1987.
This marked the first episode in which Dave Coulier voiced Peter Venkman. He replaced Lorenzo Music, who had voiced the character since the show's beginning.
This is the first episode to feature different voice talents for any of the major characters since the show's inception.
This is the first episode in which Kath Soucie provided the the voice for Janine Melnitz. Janine had been voiced by Laura Summer since the show's beginning.