The movie can be hard to watch. It's so simple in a way. But it's great."

What has worked best for him is giving time and respect to all involved. "It's really important that we show love," he says. "But at the same time, let them know they have some power in this process. If you want to work together, if you want to make a good film, there are different ways of doing it. You don't need to act like a push