A water bottle can be seen sitting behind character Samwell Tarly (John Bradley) during a pivotal scene from the final episode.
Minutes later another water bottle makes an appearance near character Davos Seaworth (Liam Cunningham).
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The production mistake comes after fans spotted a modern coffee cup near Daenerys Targaryen (Emilia Clarke) during the fourth episode of the final season.
HBO previously issued an apology for the coffee cup and edited it out of future broadcasts of the episode.
"The latte that appeared in the episode was a mistake," the network said at the time. "Daenerys had ordered an herbal tea."
Some eagle-eyed fans noticed a plastic water bottle in a scene from last night's #GameofThrones finale! pic.twitter.com/BhU0mwXcAo
— TODAY (@TODAYshow) May 20, 2019
