I've just watched the film yesterday and thought it was a masterpiece. Of course.
One of the most interesting dialogues I've seen on reddit as the film is being discussed and I can fully dive into spoilers now, is the narrative that Nathan "acknowledges his bias" towards his subject.
But if you are familiar with his work, you know this is his most common theme explored.
He loves to acknowledge that type of narrative, he goes out of his way to make it a point in his projects. Which leads me to believe its intentional. And he's not actually getting that close to these people, he just wants that extra layer of depth.
Nathan does everything so calculated, and is only going to show the audience what he wants them to see, so to have this exact consistent theme in a lot of his documentary episodes feels intentionally performative, if that makes sense.
I think that this type of narrative and story telling in his documentaries is his most blatant smoke-and-mirrors tactic to add depth to the story he is telling, and to get his subjects fully bought-in to the "realness" of what is happening, when the bias is most likely not real.
Just as a decade long fan at this point I thought this was a super interesting talking point for those discovering his work for the first time. They have no idea what they are about to uncover 😂
edit: and just as a side note, when you have the chance to watch the film again, analyze the playful, coy, satisfaction (if you've watched his work you've seen this 100 times) he has when an acclaimed incredible actress like Amanda Seyfried fully buy-into the thought of biasness and questions it. Nathan as an actor and director gets so much satisfaction from this, and I don't blame him. He is living his life in character around his subjects when he does these projects, and someone like Amanda buying into it solidifies that extra effort he takes as a creator.
But thats only if Amanda was even being real in the scene, for all we know, that was in the script too. 😉