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  ===Filming===
  Castle of Zafra in Guadalajara, Spain stood in for the Tower of Joy in the episode.
  "Oathbreaker" was directed by Daniel Sackheim. Sackheim is a first time director for ''Game of Thrones''; he also directed the subsequent episode, "Book of the Stranger".
  Filming of the first exterior scene at Castle Black and the final scene with Jon Snow executing the traitors of the Night's Watch took place over the course of several months, with the execution scene being filmed first out of the two. As a result of a rock slide that occurred on the set of where Castle Black is staged at Magheramorne Quarry, scheduling for the filming of the scenes had to be re-worked by executive producer Bernie Caulfield and producer Chris Newman, with showrunner D. B. Weiss saying, "It actually worked out for the best – some of the stuff we were shooting in that location benefited from the additional prep time the rock slide gave us."
  The Castle of Zafra in Guadalajara, Spain stood in for the Tower of Joy in the flashback scene involving a young Ned Stark and Ser Arthur Dayne, as witnessed by Bran Stark and the Three-eyed Raven. During filming of the scene, it was reported widely among media sources after a fan of the series had snuck their way onto a nearby mountain and filmed a small portion of the fighting scenes that occurred. Robert Aramayo (young Eddard Stark) spoke about the filming of the scene in an interview following the airing of the episode and stated, "We all went through a bunch of training, which continued through our three- or four-day shoot in Spain. It was intense. It was not easy. I did not find it easy to shoot that fight sequence. It's not an easy routine at all. And Luke Roberts, who plays Arthur Dayne, he's incredible, man." He continued, "If your move's getting blocked, you obviously can't know that, just like when you're playing a scene through dialogue. You can't know the response your scene partner gives you is going to be the response you'll get. You hope it is. Likewise, in a fight, if you're going to chop somebody's arm off or stab them in the gut — the intention is to chop that arm off or stab someone in the gut, and you have to play that intention fully. I didn't expect it, but it takes a lot of skill in terms of acting to play."