Betty shows Archie a newspaper article about a Geraldine Grundy who died seven years ago, an obvious reference to the comic book version of Mrs. Grundy, who is usually portrayed as a senior citizen.
Ms. Grundy tells Betty that she had once worked independently with a person named Tomoko Yoshido. In the comics, there is a supporting character named Tomoko Yoshida that resides in Riverdale.
The date shown on Jennifer Gibson's driver's license is July 30, 1982. This is Sarah Habel's (Jennifer Gibson/Geraldine Grundy) actual birthday.
Betty's milkshake orders upgrade from old-fashioned vanilla to strawberry, something that represents Betty's mental state.
At the drive in, Cheryl orders a cherry coke. Along with her accessories, this references her namesake, "Cherry Blossom".