 Although the movie takes place in 1964, the titles of three of  The Beatles (qv) songs from later on in their career are  mentioned: "Helter Skelter" (woman in hotel elevator says, "Things  are all Helter Skelter"), "Get Back" (what the police tell the  teenagers as they attempt to save Janis and Peter), and "909" (as in  "The One After 909") 