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  ===Filming===
  "The Door" was directed by Jack Bender, a first time director for ''Game of Thrones''. Bender had been previously approached to direct for the series, but declined due to the extensive time commitment involved in shooting, which Bender noted in an interview as having to commit to "four-and-a-half to six months because of the enormity of the episodes."
  Jack Bender directed "The Door", his first episode in the series.
  Shortly after the airing of "The Door", HBO released a featurette titled "Anatomy of a Scene" which went into greater detail about the creation of the final scene at the weirwood cave. Bender was interviewed for the segment, and stated "I knew it was going to be a lot of stunts, a lot of CGI, how were we going to do it? My goal was to make it realistic, make it terrifying, and make Hodor's sacrifice incredibly moving." Most of the exterior shots with the White Walkers and their army took place at Magheramorne, a small hamlet in County Antrim, Northern Ireland near where Castle Black is also filmed. With input from David Benioff and D. B. Weiss, Bender, as well as visual effects supervisor Joe Bauer, also incorporated a transposing of scenes with Wights also crawling on the ceiling and the walls, which Bender hoped would result in the scene being even more "creepy."
  In the conclusion of the segment Bender stated, "The big climactic cave sequence was hugely complex, and although it's very scary that this really terrifying thing is happening to our characters, at the end of the day I think the emotion from what we are experiencing is hopefully going to be the shock that people will stay with," referring to Hodor's implied death. In an interview with Kristian Nairn (Hodor), he described filming the scene, "It was a really heavy day — you’ve got these 100-mile-per-hour winds being blown into your face with false snow. I was really holding the door — there were like eight people pushing from the other side and I was really holding them back. It’s definitely Method acting. It was a very intense day but one of the nice things was they let Isaac wrap me. He got to come over and say "Mr. Nairn, that’s a wrap." It was very emotional. It's always been a little group of us together and it felt like our little group was breaking up." Ellie Kendrick (Meera Reed) spoke about the filming of her part of the sequence, saying "A lot of what's happening in that scene, in Meera's head, comes down to adrenaline. There's just no way she can stop and consider logically what's happening. If you have an army of the undead chasing after you, you're only going to be thinking one thing: "Run!" It was interesting, having the challenge of creating that adrenaline and fear and sadness of Hodor, but not being able to process it at all. Having to recreate that feeling of immediacy, in a stuffy studio at 4 p.m. on a Thursday when you've been filming the same scene for a couple of days, it was difficult. But it was an exciting challenge, to constantly inject the energy those characters must be feeling in that moment."
  '''Top:''' The Night King with only practical effects and prosthetics.'''Bottom:''' Added VFX in post-production, with altered eyes and an icy layer.
  Prosthetic designer Barrie Gower was also interviewed for the "Anatomy of a Scene" segment and noted "At any one time during the cave, we had so many characters which were going to be in prosthetics. We had the Night King, three White Walkers, six Children of the Forest including the hero, Leaf, and countless Wights." Gower went on to describe the process involved with creating the Children, "The Children of the Forest are fully covered from head to toe, they're glued completely into these prosthetics all over their body." Kae Alexander, the actress who played Leaf stated that it took between 9 and 10 hours to get the full body prosthetic ready for filming, a process which Bender described as challenging.
  In order to create the Night King, according to Barrie Gower, it is primarily practical prosthetic, but also incorporates some VFX to create a more icy look and feel, saying about the eyes, "The effects department alters the eyes in post-production. They give them that blue-glowy hue to them, which we can't really achieve with contact lenses." In regards to the overall prosthetic, "they've added this sort of icy layer over the top of him to create this — it's something incredibly difficult to achieve practically, prosthetics are cast in a translucent rubber, which can only give you so much of that icy quality, so visual effects help augment it a little bit further to give it more dimension." Prior to the sixth season, the Night King was portrayed by Richard Brake, with a head mold of Brake being created in order to accurately mold the prosthetic to his face. In the sixth season he was portrayed by Vladimir Furdik. The White Walker army was first shot in front of a green screen in Magheramorne quarry, and according to a piece in ''The Hollywood Reporter'' "A scan was taken from a drone and used as the basis for a CG model of the location, which was augmented with VFX and joined with volcanic hills that were photographed in Iceland." Crowd replication was used to create the 1,000-man army, with special effects supervisor Joe Bauer saying "It's scans of those actors in the makeup and costumes, with variations we used to make a digital army that extends up onto the hills." Bauer also noted that VFX were used to create the weather conditions in the scene, noting "It's wind, mist, fog and heavy atmosphere that you'd get in a marine layer. The dramatic value is to say something's wrong; it's a mystery what they are facing. The temperature drops, and our characters can see their breath. The weather obscures their vision." Spain-based El Ranchito, one of several special effects companies used by ''Game of Thrones'', was responsible for the White Walker army shots.
  Pilou Asbæk, who was cast to play Euron Greyjoy, spoke in an interview about the filming of the Kingsmoot saying "We spent two days on the Kingsmoot itself, and then two days on the montage. We shot it chronologically, which helped. The water was freezing cold. We shot the drowning many, many times. I remember looking down the shore, after I had been there for five or six hours, and I saw two smiling faces, in the form of Gemma Whelan and Alfie Allen. They were just smiling their asses off, because they weren't cold! They just had to run to the boat." In regards to stunts, Asbæk continued, "I got a little bit of help, but not much. I think 95 percent of it was me. I like to do all of it when I can, because then I can feel it with the character."
  Iain Glen, who has portrayed Jorah Mormont since the beginning of the series, also spoke about his participation in the episode, with his farewell to Daenerys Targaryen, noting "They've got a worried actor on their hands. For any actor on the show, most of the time we're just thinking, "Please keep me alive!" I've been very lucky to be a part of the show, right back to the pilot. If I go out in the madness of greyscale, then I'll have thought I've done very well. It's been a complete treat to be a part of the show. They're a lovely group of people. But the greyscale has definitely got this actor worried, I'll be honest about that."