According to co-executive producer Bryan Cogman, “What we have asked the production team and crew to do this year truly has never been done in television or in a movie." Cogman continued, “This final face-off between the Army of the Dead and the army of the living is completely unprecedented and relentless and a mixture of genres even within the battle. There are sequences built within sequences built within sequences. David and Dan [wrote] an amazing puzzle and Miguel came in and took it apart and put it together again. It’s been exhausting but I think it will blow everybody away.”
The episode took 750 people 11 weeks to do exhausting night-time filming in freezing temperatures, icy rain, cutting winds, thick ankle-deep mud, horse poo, and smoke.
When it comes to the film crew, Liam Cunningham ("Ser Davos Seaworth) told EW, “I heard the crew was getting 40,000 steps a day on their pedometers."... “They’re the f—king heroes.”