This is the first episode in which a trap is activated from inside the ghost (it had swallowed it).
This marks the first appearance of the Ghostmaster General, one of the few spirits that the Ghostbusters encounter on more than one occasion.
The Ghostmaster General was originally designed to be the Ghostbusters' main villain for the remainder of the series. His role was scaled back, however, and he only ultimately appeared in 3 episodes.
The "Three legged Hopper" ghost captured in the beginning of the episode appears in the end credits of Extreme Ghostbusters (1997).
The voice actors were recorded on July 18, 1988.