Perched on a mantelpiece behind Hugh Bonneville and Laura Carmichael, the bottle was spotted by eagle-eyed fans when the image was posted on Instagram, says the BBC. Plastic bottles were not in wide use in the UK until the 1960s - 36 years after the new series of Downton takes place. The image was later removed from Instagram and the ITV press site. H/T: GMARead more on NewsOK.com