He won't say what movie, because he wants the historical advisor guy to remain anonymous. It could be just about anything, given how many movies have come out and been terribly historically inaccurate. Anyway, my point is that the people who make films really don't care about accuracy.
They don't care about accuracy to real life events (http://www.cracked.com/article_17326_6-movies-based-true-story-that-are-also-full-shit.html), computer science (http://www.cracked.com/article_15229_5-things-hollywood-thinks-computers-can-do.html), firearms (http://www.cracked.com/article_18576_5-ridiculous-gun-myths-everyone-believes-thanks-to-movies.html), law enforcement (http://www.cracked.com/article_18385_7-bullshit-police-myths-everyone-believes-thanks-to-movies.html), interpersonal relationships (http://www.cracked.com/article_18435_5-movie-romances-that-wont-last-according-to-science.html), court systems (http://www.cracked.com/article_18815_the-5-most-wildly-illegal-court-rulings-in-movie-history.html), the books they're based on (http://www.cracked.com/funny-3066-5-movies-that-dont-resemble-book-that-were-based-on/)... as long as it sells tickets (http://www.cracked.com/article_15014_11-movies-saved-by-historical-inaccuracy.html).