'Danny Collins' trivia and fun facts

The key song in the film is written by Ryan Adams, and the version playing in the background actually features Adams singing.

Inspired by the story of singer Steve Tilston, who received a letter from John Lennon 34 years after the artist wrote it.

The pictures on the wall of Collins' house (around 10 mins in), are all pics from previous Pacino roles; The Godfather, Serpico etc.