GoT Starbucks Cup
I really thought it was Photoshopped, so I went back and rewatched that scene. There it is. I know it's easy to miss things when shooting, but you'd think an editor would've noticed it. Or any one of the multitude of people that screened it before it actually aired.
That said, I didn't notice it last night. I don't think anyone would've unless it had been called out on social media.
Gizmodo has an article about it, and includes the social posts.