Of note was the use of "The NeverEnding Story", the theme to the 1984 film of the same name, which is used in the final episode when Suzie refuses to provide the critical code until Dustin sings it to her. The Duffers had wanted to introduce Suzie into the show's narrative in some dramatic fashion while giving Matarazzo, who has sung on Broadway before, a chance to show off his own vocals.