Principal photography began on July 6, 2021 (almost a year before Totally Killer (2023), a similar genre film, was first announced) in Winnipeg, Canada, and ended in August, with cinematography work done by Tony Mirza and Halyna Hutchins before Hutchins worked on her final film, Rust (2024).
The movie was delayed because of the SAG-AFTRA strike. As such, the "present" year was changed from 2023 to 2024. However, Lucy still says it's been 20 years since Summer died, even though it's been 21 years.
Several fashion items trending from 2003 can be seen in the halls of the high school, most notably the Ugg boots and Juicy Couture velour pants.
Summer's full name is Summer Lucy Fields.