The movie was released five months after John Lennon was murdered by obsessed fan Mark David Chapman outside The Dakota, the famous New York City apartment building--coincidentally, also the real-life home of Lauren Bacall. Fifteen years later, Robert De Niro starred in another movie of the same title, The Fan (1996 film), about an obsessed sports fan who admires a baseball player (Wesley Snipes)--but who then stalks him and ultimately menaces him and his son.
Robert De Niro
Wesley Snipes