Llamas?

The Guardian has a regular series of entertaining/nitpicking criticism of Hollywood history films - or rather, points out how Hollywood doesn't really make the effort. Sometimes they've changed things because they think it'll make a better story - or at least a simpler one for their audience - other times... well, it's hard to know what they were thinking. Take one problem with Troy, listed in the latest article - the makers had banged on about their authenticity, but as the article says

it's hard to see why you'd go to the trouble if you're just going to fill the marketplace with llamas.

I imagine a historian has much the same problem with "historical" films as I have with "science" fiction films as a scientist - they use real thing utterly incorrectly just because they can't be bothered.