The voice actors were recorded on November 14, 1986.
Coincidentally, this episode has some parallels to "Ghostbusters II" including a brightly colored goo bubbling up from the sewer and a Ghostbuster hanging from a rope over a pit. The episode predates the movie by two years.
The plot is based on the urban myth that Manhattan was built on a pillar.
After the team feels an earthquake, Ray remarks the Firehouse is as strong as the Rock of Gibraltar, a famous landmass near Spain.
As Peter gets into his bathroom mishap, he refers to Popular Mechanics, an American magazine that features articles about automotive, home, the outdoors, science, and technology.