When I went and watched this "documentary" last March, Joel's mother was in the audience. During the Q&A session at the end, one of the questions that was asked of Joel was, "What did your mother think of you making this film?" His answer was, and I am quoting him exactly, she said to him - "Just make sure you put us in a good light!"
Now I don't know how much pull his mother had in the making of this film, but once you view it, you will see that he stayed within the boundaries of her request. Plus, it is soooo obvious that the entire film was positive towards the jw's --- the bros from bethel wouldn't be making an appearance if it wasn't.
Just you wait and see. I guarantee that if Joel decides to make another documentary showing the other side of the jw's, bethel will not participate whatsoever. They would probably even ban his cameras from even entering the kh's.