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Chapter 27 is based on the Mark David Chapman biography, Let Me Take You Down (1992) by Jack Jones. Mark David Chapman is the man who murdered Beatle John Lennon on 8 December 1980.

Mark David Chapman was obsessed with the novel Catcher in the Rye (1951) by American author J.D. Salinger and, in fact, was carrying it when he shot John Lennon. Salinger's novel has 26 chapters. The title of the movie Chapter 27 suggests a continuation of the novel and Chapman's attempt to model his own life after the book's protagonist, Holden Caulfield. According to Nowhere Man: The Final Days of John Lennon (2000) by New York journalist Robert Rosen, it was Chapman's goal to write Chapter 27 in Lennon's blood. Rosen also explores the numerological meaning of the number 27 or "triple 9", a number in which Lennon professed to have a deep interest.

Absolutely not. Mark Lindsay Chapman, who was ironically cast as John Lennon in this film, is not related to Lennon's real life killer. They just have similar names.