Why do you suppose that the author(s)/producer(s) of this provocative film didn't take credit for their work?

Its not an alternative conspiracy theory here. I just always read who is trying to influence my opinion to be aware of their backgrounds and points of view.

I suspect that the authors of this Zeitgeist Movie are probably people like David Icke who is cited in the sources and who is certifiable. Go onto his website and he pretty much covers it all and tries to wrap it up into one theory just as they do in this movie: www.davidicke.com
Lizard people and all.