Based on the 2017 short story, Cat Person, written by Kristen Roupenian, published in The New Yorker. The story was written as a response to the Me Too movement.
Netflix offered to buy worldwide rights for the film for $5 million, but it was declined given it wouldn't receive a theatrical release on a $12 million budget.
The movie you hear playing but don't see when Margot is talking to Robert in the theater is American Graffiti. Specifically, when Carol is talking to Milner.
Emilia Jones and Nicholas Braun became good friends during production, and claimed it helped their performances and made the sexual content less awkward.
When Margot notices him across the street from the cinema, the movie posters "WItness" Man on Fire"