The same Stay-Puft Marshmallow sign/billboard. “Sub-creatures! Gozer the Gozerian, Gozer the Destructor, Volguus Zildrohar, the Traveler has come! Choose and perish!” – Gozer, Ghostbusters, 1984.

Blink and you’ll miss it. Towards the end, when the Ecto Containment System is shut down and the ghosts escape, keep and eye out for the billboard for Stay-Puft Marshmallows. The Stay-Puft Marshmallow Man is unmissable, heralding the form of the Destructor.
Check out the name of the mining company, Shandor Mining Co, named after the cult of Gozer leader, Ivo Shandor. Shandor was contracted as the architect for an apartment building at 550 Central Park West. He secretly designed the building to act as an antenna for pulling in and concentrating spiritual turbulence (Ghostbusters 1984 canon). In turn, Ivo Shandor is named after Anton Szandor LaVey (1930-1997), founder of the Church of Satan (est. 1966).