Apocalypse Now is one of my all-time favorite movies. I am told that the "making of" movie is almost as good, though I have not seen it. The story behind the movie is certainly fascinating. But I feel like I know a bit more about it now, having read Kim Newman's Coppola's Dracula, which got a World Fantasy Award nomination in 1998.
The story follows the making of Coppola's best-known film as though it were Stoker's Dracula story, with all the weird challenges of filming in Wallachia as opposed to the jungle. And with real vampires, though not so scary. It's a very interesting reinterpretation, even if it does get a bit long in places. It grows on you as it goes along. If you like Apocalypse Now or have not seen it, you will like this story as a taste of it. 3 stars, I liked it a lot.