The episode won an Emmy Award for Outstanding Sound Editing for a Comedy or Drama Series (One Hour).
Did you talk to your mom? About Thanksgiving?
Mike Wheeler: Yeah. Yeah, yeah, yeah. I got the okay. I'll be there. And then I was thinking maybe you could come up here for Christmas. And Will too. You can come here before or after Christmas or whatever Mrs. Byers ...
The Wheeler Family station wagon is a Ford with a 5.0 HO engine (you can see this when the hood is opened). But the engine is fuel injected (no carburetor), which wasn't available on the 5.0 HO engine until 1986. It's doubtful that in July of 1985 that the Wheelers would have a 1986 Ford.
The mid-credits scene takes place in a Russian facility and sees Russian soldiers take a prisoner into the feeding cage of the Demogorgon.