Not sure if anyone's brought this up yet, but I'm sure the Gnostic teachings that were in the book will probably be promoted by the movie as well. Here is a blog that has a lot of information.
http://www.aomin.org/tdvc.htmlIt is mostly about the history of the early church, and dispelling claims the book made about the Bible being altered to fit man's agenda. It is a bit of a long read, though, so for anyone who is interested but doesn't have the time, here is a briefer synopsis without as much info:
http://www.contenderministries.org/discrepancies/davincicode.phpAlso, a book review which exposes a lot of the sources which Dan Brown used.
http://www.crisismagazine.com/september2003/feature1.htmI know I've had some questions from people already. Also, i'm sure a lot more people will be picking up Holy Blood, Holy Grail with the recent publicity of the lawsuits. Why can't people just stick to scripture?
Personally, though, when it comes to people questioning the authenticity of the Bible, I say, "Look, you either have faith or you don't. If God was going to put His living word down on earth, I think he's powerful enough to ensure it wouldn't get corrupted." I've been down that road myself, and I know once I let just a trickle of doubt come through, it turns into a flood.