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  ===Filming===
  The Cathedral in Girona, Spain stood in for the Great Sept, with some extending CGI altering the building.
  "Blood of My Blood" was directed by Jack Bender, who also directed the previous episode "The Door", his directorial debut for the series. Bender had been approached to direct for the series but declined due to the extensive time commitment involved in shooting, which he noted in an interview as having to commit to "four-and-a-half to six months because of the enormity of the episodes".
  For the primary King's Landing scene at the Great Sept, with Margaery being presented to the city by the High Sparrow, the grand staircase of the Girona Cathedral in Girona, Spain was used. The cathedral was constructed in the 11th century, and continued its expansion throughout the 12th and 13th centuries, as well as the 18th century. According to prior reports, filming took place over the course of approximately two weeks, with many different challenges involved in shooting at the location, including "extras requiring medical attention due to exhaustion and dehydration," as well as the need for extensive security to close off certain areas, during filming, from the public. Parts of Braavos were also filmed in Girona. In nearby Canet de Mar, Catalonia, Spain, the Castell de Santa Florentina, an 11th-century medieval castle, was utilized for the castle of House Tarly.
  The director of the episode, Bender, conducted an interview with ''The Wall Street Journal'' following the airing of the episode, and spoke about filming the play with Arya in Braavos, stating "I staged the whole play, we did it, and the producers came in to watch the rehearsal, including all the fart jokes, all that stuff, some of which was written. So, after we watched the rehearsal, and the guys laughed a lot, I said, 'My only concern is, am I mocking your brilliant show too much?' And they said, 'No, do it more!' They're completely unpretentious, David and Dan, and they loved it." He also noted that several other extra scenes were filmed, but were cut from the final version of the episode, noting that they will likely be released as deleted scenes on the DVD for the season.
  In the behind the scenes video published by HBO following the airing of the fifth and sixth episodes, Benioff described Bran's visions at the beginning of the episode as being something that was put together very precisely and purposefully, noting "Even though some of those images flash by in just a fraction of a second each of them was very carefully chosen. And the Mad King was probably the most dramatic of those because we've been hearing about the Mad King from the very beginning of the show, but he's never appeared on screen before. And shooting it, you know, spending a lot of time on what ended up being maybe like a second and a half, couple seconds, of screen time." The new scenes of the Mad King, Aerys II Targaryen, are interspersed with previously shown footage of the White Walkers, as well as wildfire explosions, and other landmark moments from throughout the series, such as Ned Stark's beheading, the Red Wedding, and Bran falling from the Broken Tower in the series premiere. In the ''A Song of Ice and Fire'' series by George R. R. Martin, the Mad King is described as having long, unkempt hair and beard, with nine inch long fingernails. The show's version portrayed his look in a more tidy fashion, with David Rintoul playing the role of the Mad King.
  Ellie Kendrick, who portrays Meera Reed in the series, in an interview with ''The Hollywood Reporter'' spoke about the re-introduction of Benjen Stark, or Coldhands Benjen, and working with Joseph Mawle, saying "It was so fantastic. And it's interesting. If you've read the books, then you know about the Coldhands character, who was cut out of the Bran, Meera and Jojen storyline on the show. It was always interesting, having read the books, watching this amalgamation of story lines happen. Benjen is sort of like the Coldhands character in that he's a slightly suspicious guy who is half-dead and half-alive with blue hands. I thought that was very cool, the way it happened. It was a nice marriage between the book and TV revelations rolled into one. I was very excited having him on set. I loved working with Joseph Mawle, and I loved having another member of our rapidly dwindling gang."