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Trivia: The trailer for the film famously used 50 Cent's song "In Da Club" as Tree's birthday ringtone. However, the song is not present in the final film. Director Christopher Landon confirmed in a 2022 commentary track for the film's 4K release that they originally wanted to use the song in the film, but couldn't afford the rights due to their tight budget. But annoyingly, the adverting budget (which is separate from the film budget) meant they could afford to use it... but only in the trailers.

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Trivia: "Happy Death Day" shares some pretty interesting parallels to the movie "Before I Fall." Both films feature a young woman who is trapped in a time loop. Both films were released in 2017. Universal Pictures handled the home-video distribution of "Before I Fall" and the theatrical distribution of "Happy Death Day." And Halston Sage and Logan Miller both co-starred in "Before I Fall," in addition to "Scout's Guide to the Zombie Apocalypse," which had the same director as "Happy Death Day."

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Trivia: Director Christopher Landon tested out the killer's mask by putting it on and scaring co-workers in his office one day. Once he saw the genuine shock on people's faces, he gave the mask the go-ahead to be used in the film.

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Trivia: Originally, the school's mascot (and thus the killer's mask) was going to be a cute, anthropomorphic pig. This was eventually vetoed, as it was considered too similar to the "Saw" series, in which the killer sometimes wears a pig-mask when he abducts his victims.

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Trivia: The killer's mask was designed by Tony Gardner. If that name sounds familiar, you're probably a big horror fan. Aside from the killer's mask in "Happy Death Day," Gardner also helped design the final look of "Ghostface" seen in the"Scream" franchise (albeit loosely based on an earlier design), worked on a number of cult-films including "Darkman, "Hocus Pocus" and the "Evil Dead" sequels, and has worked as the main effects supervisor on a number of the "Chucky/Child's Play" films.

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Trivia: There actually is an in-universe explanation for why Tree got stuck in a time-loop. However, director Christopher Landon opted to omit it from the finished film. Partially because it could be used in a potential sequel, and partially because it wasn't necessary for the narrative. Landon has hinted that the upcoming sequel, "Happy Death Day 2U," will finally reveal the explanation.

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