Ray reveals Chapter 27 of Tobin's Spirit Guide is titled "Botanical Specific Avoidance in Spectral Manifestations."
The voice actors were recorded on August 27 and 29, 1986. Laura Summer recorded alone on August 29, 1986.
In the June 30, 1986 script, the banquet at the start of the show takes place at the posh "Waldorf Hibernia" hotel, a reference to New York's Waldorf Astoria.
The June 30, 1986 script revealed there was one more scene with Egon chasing the Bog Hound. It took place at the Natural History Museum and involved the disruption of a Tyrannosaurus Rex skeleton.
When Peter returned to the Firehouse with the four leaf clover, Egon mentioned Cuisinart which is a brand for small kitchen appliances.