The voice actors were recorded on August 3 and 9, 1988. Dave Coulier recorded alone on August 9, 1988.
First episode with an overt, pro-environmentalist message.
Janine's car is borrowed once more by the Ghostbusters. The first time was in Beneath These Streets (1987) and then again in It's a Jungle Out There (1987).
This marks the second time in the series that Ecto-1 is possessed by a ghost. The first was in Killerwatt (1986).