The scene of a museum curator discussing an artifact which perplexed Gesualdo was scripted by Herzog. In fact the artifact shown in the film had puzzled Herzog himself and caused him to lose sleep, and had no connection to Gesualdo.(Wikipedia)
I can believe that. That part didn't ring true at all, because it seemed so random. Herzog just introduces it as if to say: "Oh, here's something." Gesualdo's obsessions were known to be with music, not oddly inscribed coins of unknown provenance.
And: the woman in red who was singing-- Herzog makes it appear like he was filming and just happens upon her and did not already know who she was, nor why she was doing it. (He expects us to believe this?)
He spends 3-4 minutes showing a guy playing music in Gesualdo's castle (to keep the demon, Gesualdo, in). But that music wasn't Gesualdo's music. So, does he have to spend that much time with a fanciful villager?
The boy coming down the zip line.
The ending, where the guy on his phone explains to his mother that he's sure he'll be done soon, that the documentary filming will be done soon. (And the documentary ends.)
A lot of surreality, which was entertaining but not informative as such. He seemed to have a lot of footage, not all of it directly related to his stated topic, and left it in, when really it should've been edited out. Or called it something other than a documentary on Gesualdo.
I think this is unfortunate, because with Gesualdo, there's so much bizarreness and morbidity to his life, that if you throw in all this fanciful stuff, it dilutes and makes you doubt the truth of his life that we do know.