The National Academy of Sciences has formed "The Science and Entertainment Exchange" (SEE). The main purpose of this is to advice movie makers on accurately portraying scientific and technological concepts, and to make sure they don't make obvious science blunders, I suppose.
Relying on the special connections available to the NAS, the Exchange can make introductions, schedule briefings, and arrange for consultations for anyone developing science-based entertainment content. Endorsed by the Directors Guild of America, Writers Guild of America, Producers Guild of America, the Entertainment Industry Foundation, and Women in Film, this new resource is being promoted to all levels of writers, directors, producers, and others in the entertainment industry. Professionals involved in the creative process may contact the Exchange to be connected with scientists, engineers, health professionals, and other experts for help with their productions and stories.
I'm not sure how popular this become. I can see how movies with a direct science/technology/mathematics/etc subject matter (i.e. Contact, A Beautiful Mind) would benefit from such accurate advice, but for movies without a direct science subject matter (i.e. action/adventure), why would they care of the movie is scientifically sound? Have you seen the latest Indiana Jones movie? How many times are you asked to suspend all knowledge of physics in that one? Would Lucas/Speilberg want to seek advice from such an organization?