They are entertainment.

But there's no clear line between entertainment and propaganda. Birth of a Nation had some very powerful results, for example in giving the Klu Klux Klan a new lease of life.

I don't see 10,000 BC having any equivalent effects, but there are still films where it matters that they should be basically truthful.

So far as woolly mammoths go, it might be nonsense, but it's not self-contradictory nonsense to have them in Egypt. after all, elephants aren't native to England, and I've seen a good few here in my time. And the car I drive was made in France.

Though if they'd wanted to use pachyderms to build pyramids a few thousand years early, there were still elephants in North Africa in those days, who would have been easier to obtain.