The kids fight Mysterio. He wants to get everyone to move out of an apartment building, so he tries to scare them out by creating illusions that it’s haunted.
He does it by creating an image of Slimer from Ghostbusters.
Bad luck for Mysterio: It happens to be the house where the Power family lives.
At this point, pseudo-realism in comics still wasn’t a thing, making coincidences like this a little more tolerable, but after three decades of relying on these kinds of devices to set up—or resolve—storylines, it’s time to move on.