The bloater stuntman, Glenn Ennis, was required to use cooling pads and a cooling tent before being hit with the flamethrower, which he performed around 12-14 times; Mark Mylod thought they "almost gave him hypothermia".
The weather impacted production; filming occured during a blizzard, including the scene in which Abby is chased by infected.
Craig Mazin and production designer Don Macauley conceived the alley standoff between Tommy and the bloater after filming had occurred; it was filmed four months later, on a private property at Minaty Bay in Britannia Beach across five days--June 5, 7, 12, 13, and July 2--with smoke and flame pyrotechnics present.
The episode gets its title from the song "Through the Valley" by Shawn James. The song was prominently featured in the the video game's first trailer.
Pedro Pascal bonded with Kaitlyn Dever, who portrays Abby; he found their close relationship ironic considering their characters' conflict but felt it made them closer.