During the shopping montage, the girl, Stacey (Sydney Bullock), at the shoe store and the girl whose drink explodes by Eleven (Millie Bobby Brown) is the same girl who rejected Dustin (Gaten Matarazzo) at the Snow Ball in Chapter Nine: The Gate (2017).
When Joyce goes to see Mr Clarke there's a mini model of Betelgeuse's grave as featured in Beetlejuice. Winona Ryder also played Lydia Deetz in the same movie
Hopper (David Harbour), while extremely drunk at the restaurant makes the statement, "I can do anything I want. I'm the chief of police." Martin Brody (Roy Scheider) makes this same statement (also while quite drunk) in the film Jaws (1975).
Just before Joyce Byers (Winona Ryder) arrives at Mr. Clarke's (Randy Havens) house, the song "My Bologna" by ('Weird Al' Yankovic) is played. The song is a parody of the song My Sharona by the band (The Knack). The song is featured on the soundtrack of the film (Reality Bites (1994)] starring, among others, Winona Ryder.
This episode takes place from June 29 to June 30, 1985.