The episode was recorded on July 17 and 19, 1989.
Dave Coulier recorded alone on July 17, 1989.
This is the only one of the 12 minute episodes to have a ghost return from another episode. This is the second and last appearance of the Ghostmaster.
When Ghostmaster announces his plan to make the Ghostbusters his servants, Peter concludes he's a Type A personality; overly ambitious and controlling.
Ray and Egon conduct research at the New York City Public Library.