Daenerys' SBUX Cup Proved Truth Behind Hayek's Fatal Conceit

One would think that the collective expertise of everyone involved in a production as world-renowned as GoT would catch something as simple (and seemingly obvious) as a coffee cup in a scene that millions would view.Yet neither the director, set designer, director of photography, prop master, movie editor, any of the actors or extras, or producer caught the cup at the time of filming or throughout the production process.