David F. Sandberg conceived the closing credits title sequence with the missing persons posters during filming, believing it would be a "really fun" way to end the movie. "I thought it would be really fun for the end credits to have missing posters of the whole crew and cast on that board. So I wanted to do that, but I was also clear to everyone, "You don't have to do it if you don't want to." The editor Michel Aller chose a childhood picture of herself, so it looks like a child edited this movie. (Laughs.) When I showed the movie to everyone else, they were so envious of her. They were like, "You could use a childhood picture? What the fuck!? Why didn't I think of that?" But everyone thought it was a fun idea to do that, and I love it because you get to see the people who made the movie, for a change."
Dr. Alan J. Hill (Peter Stormare) whistles throughout the movie an old Swedish nursery rhyme from 1892, called "Tula hem och tula vall". Stormare and director David F. Sandberg hail from Sweden.
Clover and her friends stop at a convenience store named "Hartley's." The name refers to Chris Hartley, Josh's friend and one of the eight playable characters in Until Dawn (2015).
The film is an original story set in the universe of the video game Until Dawn (2015), instead of being a direct adaptation. Director David F. Sandberg was very open about making an original film: "The game is pretty much a 10-hour movie, so I think it wouldn't have been as interesting for me if we were doing just the game, because then it's going to be like a cut-down, non-interactive version of the game, which just wouldn't be the same thing."
Lotta Losten: Wife of David F. Sandberg, appears on a TV screen as the reporter who covers the mining disaster.