Corrected entry: If the movie takes place supposedly around 10.000 BC, the final kiss was completely inaccurate, since anthropologists have established that kissing as seen today was only "invented" in India around 2000 BC, and perfected by the Romans. They had actually gotten it right throughout the movie, the nose rubbing or joining of foreheads, but they couldn't resist making the mistake in the final shot. And when the kid makes the kissing motions, it is a reference to the same mistake.
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Correction: As with any historically set film, many things have been updated in order to make sense to modern-day audiences. Thus we see the use of colloquial English, modern-day units of measurement and so forth. This is an entirely standard movie convention and is not considered a mistake.
Tailkinker ★