The movie in the theater is called Love, Simon. It came out in real theaters 10 days after this episode aired. The use of the film in the episode was explicit cross promotion by Executive Producer Greg Berlanti, who is also the Director of Love, Simon.
A scene was deleted from previous installment Chapter Twenty-Six: The Tell-Tale Heart (2018) which showed Hiram Lodge about to discuss a business proposal with Hal Cooper, the nature of which is disclosed in this episode.