Hearts of Darkness: A Filmmaker's Apocalypse (1991).
The making of Apocalypse Now is brilliant.
How Martin Sheen had a heart attack on the set, Hopper on LSD, Coppola putting his house on the line to finance his movie and Brando a payment of $1 million upfront before even thinking of coming to the set. He eventually arrived 1-2 weeks later with an arrogant look on his face and in a bad mood. Ha!