The set for Kingston Falls is the same one used for Back to the Future (1985). Both movies were filmed on the Universal Studios backlot

The Santa speech proved to be controversial and studio executives  insisted upon its removal because they felt it was too ambiguous as to  whether it was supposed to be funny or sad. Director Joe Dante however stubbornly refused to take the scene out saying it represented  this movie as a whole, which had a combination of horrific and comedic  elements. Executive producer Steven Spielberg did not like the scene, but despite his creative control, he viewed  this movie as Dante's project and allowed him to leave it in

The Gizmo puppets were particularly frustrating because they were  smaller, and thus broke down more. Consequently, to satisfy the crew, a  scene was included in which the gremlins hang Gizmo on a wall and throw  darts at him. This was included on a list that the crew created known to  them as the "Horrible things to do to Gizmo" list

Features Darlene Love "Christmas! (Baby Please Come Home)" as the opening titles music