At the very end of this documentary, the essence of what they were saying (imo), is to keep your mind open, to many possibilities. Excellent advice.
I'd read the book a few years back, and found it interesting and thought provoking. Like many others, there are some realities in our society which are pointed out in Freakonomics, that aren't too comfy for me to accept - nonetheless, there's abundant research backing their findings, which compels me to think more deeply. (And that's a good thing). I don't believe everything I read, either - discernment in all things, is what I think we should all practice.
Although I'd read the book, I liked the film, also - in some ways, it added more dimension to what I'd read before. I must have glossed over the severity of corruption in sumo wrestling, back when I read the book. Watching that part of it in the film, had much more of an impact on me. All in all, I'd recommend this film.