Hearts of Darkness: A Filmmaker’s Apocalypse is an engrossing, unwavering look back at Francis Ford Coppola’s chaotic, catastrophe-plagued Vietnam production, Apocalypse Now. Filled with juicy gossip and a wonderful behind-the-scenes look at the stressful world of moviemaking, the documentary mixes on-location home movies shot in the Philippines by Eleanor Coppola, the director’s wife, with revealing interviews with the cast and crew, shot 10 years later.