You don't have to imagine a horse expert getting upset about unrealistic portrayals of horses. Check out this take on the Spielberg film _War Horse_ for a lack of "agricultural realism:" "Ploughing that stony virgin (never ploughed) field with a team of sturdy cobs would have been improbable; with a puny thoroughbred it was ludicrous."
http://www.riverford.co.uk/feed/in:news/ploughing-spielberg-...