Visible crew/equipment: When Billy's mom takes the picture of Gizmo at the beginning, Gizmo becomes frightened and runs over to Mr. Peltzer. When the scene is slowed, you can see the puppeteer's hand underneath while operating the Gizmo doll. (According to MM's rules, the use of slow motion is permitted when the mistake is something significant.) (00:19:10)
Randall Peltzer: Well, that's the story. So if your air conditioner goes on the fritz. Or your washing machine blows up. Or your video recorder conks out; before you call the repairman, turn on all the lights, check all the closets and cupboards, look under all the beds. Cause you never can tell. There just might be a gremlin in your house.
Trivia: At the beginning of the film, when Billy is late for work, you see two films playing at the movie theater: "A Boy's Life" and "Watch the Skies." The former was the original title for "E.T." and the latter was the original title for a proposed sequel to "Close Encounters of the Third Kind." Two films directed by executive producer Steven Spielberg. (00:08:30)