The Grantham Family ashtray from the first segment of the movie 'Creepshow' appears in both segments, first in a display case in Skeletons In The Closet, then on a shelf in Familiar.
At the beginning of the segment "Skeletons in the Closet" we see two license plates on display. One is a California plate, CQB 241. It's the plate on the famous 1958 Plymouth Fury named "Christine" in the film based on the Stephen King book of the same name. The second plate is a Michigan plate, partially obscured, and we can only see the last three letters KTL. There's little doubt that this is the plate seen on Ash Williams' 1973 Delta 88 in the television series Ash vs Evil Dead. The complete plate number reads 3971 KTL.
In a 2021 interview with Den of Geek, Greg Nicotero detailed a behind-the-scenes in-joke from "Skeletons in the Closet": "Most of the stuff in that museum is stuff from my actual collection of props, up to and including my favorite joke, which I'm probably the only one who's gonna laugh at it, but, the decapitated head of David Warner from The Omen (1976). Because while we were writing that, that head went up for auction and I actually won. So I actually bought it. And I have it and we restored it because that was like the first movie decapitation I ever remember seeing that just blew me away. So when he's like, 'Aaaah!' and she's like, 'What's the matter?' 'Ah, I got outbid.' 'What were you bidding on?' 'David Warner's decapitated head from The Omen.' She's like, 'Aww, babe.' I laugh so hard every time I hear that line."
When Jackson goes back to Boone's, The bottle on the table looks like a ''J&B Scotch" parody, a regular sight in 80's Italian horror movies.
The character Boone in "Familiar" is likely a nod to Aaron Boone from Nightbreed