For background Halloween ambiance I throw on the Hell House LLC trilogy (free on Tubi). Other favorites for this time of year: Trick 'r Treat, Idle Hands, WNUF Halloween Special, Satan’s Little Helper, and Cabin in the Woods.
If you’re looking for a new movie this year, Cobweb came out in August and has quite the Autumn/Halloween vibe.
Smoke enough and he’ll finally start seeing the toys move on their own.