Several images and lines are referenced.
The Bride is one of the Halloween monsters seen.
The school is named Daniel Webster because of the historical figure's connection with this horror story.
Before heading to the Tesla factory to rescue Kathy, Sarah, Sonny and Sam disguise themselves as Halloween characters in order to blend in with the monsters rampaging through town. Their disguises are comprised of a skeleton, a witch and a pumpkin similar to the "Silver Shamrock" masks in Halloween III Season of the Witch.
Slimer and Stay-Puft Marshmallow Man dolls seen in Sonny's bedroom
Mentioned in dialogue.
The poster is shown
movie is reviewed
Photos from the movie is shown
Chris reviews the movie.
R.L. Stine see a single red balloon and states he thought of that first alluding to It.