'Downton Abbey' photo features plastic water bottle

Can you spot the mistake?

This publicity photo promotes the upcoming fourth season of "Downton Abbey." But look closely, above the fireplace.

That's right; it's a plastic water bottle. Since the series is set in the 1920's, it's very much out of place.

And as some have suspected on Twitter, it's either a very stupid mistake or a brilliant publicity ploy.
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