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  ===Casting===
  Kristian Nairn has portrayed Hodor since the beginning of the series.
  "The Door" marks the final appearance of Kristian Nairn as Hodor, a role Nairn has played since the series pilot. Nairn, who was cast to play Hodor from previously knowing ''Game of Thrones''' casting director from an audition he did for the film ''Hot Fuzz'', admitted in an interview that he was at first unaware of his impending death in the show. He stated, "First I heard from friends, people who had read the script, some other cast members. I think I said laughingly, "So did I survive?" They just gave me a look, and I was like, "Whaat?" Then I had the call from David and Dan, the fateful call everyone gets when your number's up. Then I read the script – which I loved. I loved the scene. I can't think of a better way to go, really. He doesn't give up. He never lets go of that door. For all costs, he's going to stop them from getting to Bran." Reflecting on playing the role, Nairn also went on to note, "People always joke, "Oh you've got the easiest role, you don't have any lines to learn." Anyone who knows anything about acting has been like, "You actually have one of the hardest roles." Because you have to articulate so much without words."
  In the Braavos scene, several actors were cast to portray actors participating in a play titled "The Bloody Hand" that re-created the history of the beginning of the series, from an altered point of view. One of the actors that was cast included Richard E. Grant, who portrayed the leader of the theatre troupe, Izembaro. Kevin Eldon, who played the role of Eddard Stark, was also cast, and Essie Davis as the lead actress Lady Crane, among others. The Icelandic band Of Monsters and Men appeared in this episode in a cameo as stage musicians for the stage play.
  Israeli actress Ania Bukstein was also introduced in the series as the High Priestess Kinvara, who is brought to Meereen to spread propaganda about Daenerys Targaryen's supposed success at eliminating the problem with the Sons of the Harpy. In an interview with Bukstein she said, "Yes, it's very exciting, but let's calm down. It's not like I'm the new Khaleesi. ''Game of Thrones'' came after a ton of hard work. I filmed a lot of audition tapes in front of a white wall at home. I've paid my dues for years." Bukstein also stated that she had previously sent in an audition tape to the series when it was first casting its first season, saying, "A few years ago, when they had only begun to cast the first season of ''Game of Thrones'', I sent an audition tape. I didn't really know for which role, and I mainly didn't know—and neither did the world—what a hit the series was about to become. But I remember that even then, the scenes excited me and I completely went with the style."