http://www.digitalspy.com/tv/twin-peaks/news/a832484/twin-peaks-david-lynch-scenes-art-inspiration/

FILM 1252: HEARTS OF DARKNESS: A FILMMAKER'S APOCALYPSE

TRIVIA: Marlon Brando allegedly refused to be interviewed because he claimed Francis Ford Coppola still owed him $2 million.

Francis Ford Coppola initially had no desire to release the documentary on DVD, due to him disagreeing with the way he is depicted. It was finally released on DVD in 2007, albeit with an optional Coppola commentary track that clears many things up. In 2010, it was even released in the "Full Disclosure" Blu-ray edition of Apocalypse Now (1979).

It was briefly considered to replace the voice of Eleanor Coppola with that of a professional actress, but that was rejected.