The mall used as the robot safe haven is North DeKalb Mall in North Decatur, a suburb of Atlanta, Georgia. It opened in 1965 and closed in 2020 before being demolished in mid 2024. The mall had previously been used in episodes of Loki and Cobra Kai as well as the Fear Street trilogy and feature films Civil War, The Mule and Zombieland: Double Tap.
Whenever a drone's heads up display is shown, the sound effect is the same as the terminator's heads up display from Terminator franchise.
When Keats goes into "Greaser's Diner" to try to order something to eat, the "Specials" board suggests customers to "Have a byte of Pi" for $3.14159265359.
Michelle Yeoh was originally cast but had to drop out due to scheduling conflicts. The role was reworked and her former co-star, Ke Huy Quan, took over.
The Russo brothers first acquired the rights to Simon Stålenhag's graphic novel in 2017, a year before its publication, and Andy Muschietti was set to direct. Universal won the distribution rights in 2020 after a "heated bidding war," and Muschietti had to step down due to his preoccupation with The Flash (2023). Netflix then picked up the film in 2022, and shooting finally began that year.