Black Metal went global as the crew worked from nine separate locations: Los Angeles, the Bay Area, Oregon, Seattle, Florida, Minnesota, Canada, India, and China.
The film is filled with easter eggs, including:
The priest from the first church scene is actually a secret metalhead, and he appears in one of the concert's crowd shots near the end of the film.
The saints in the stained glass of the church are the band members from Cosmophobia.
Each crew member designed their own title card for the credits.
The metal music has the same melody as the church music.
The entire film was completed virtually during COVID-19.
The film was originally supposed to be a live action, 12-minute short, but was adapted to a 4-minute animation because of the pandemic.