This is how documentaries on directors should be made from now on. Not try to get a zillion talking heads but just let the person speak for the entire runtime. Then again, you need the guarantee that they're as captivating as Brian De Palma, who, very much like his movies, is always provocative and honest, regardless of whether that works out in favor of them. The only flaw was that I could've listened for three hours to the man.
It flounders a bit despite its relatively short running time, but the unadulterated joy of everyone involved and the excellent camp make up for a lot. The songs were classics even before the movie was released (due to it being a television show before this) so of course those are excellent, too. We need more Dutch musicals, stat.