I don't think it's the point of movies to get it right. The point of movies is entertainment. Look at "10,000,000 BC" -- Farah Fawcett looks fetching in a brief leather costume, but Homo was not yet Neanderthalis, much less Sapiens, back then AND dinosaurs were long extinct.

I could go on, but I'll only give a few more examples: Birth of a Nation; Tora, Tora, Tora; In Harm's Way; Sands of Iwo Jima; Apocalypse Now; Full Metal Jacket; The Longest Day; The Alamo; El Cid; Lion In Winter; A Man For All Seasons....

Some of these are very very good movies, but they are not factual history. They are entertainment.