Trivia for Happy Death Day
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- Originally titled "Half to Death."
- According to director Christopher Landon, Tree's punchline, "Who takes their first date to Subway? It's not like you have a foot-long," was improvised by Jessica Rothe.
- Megan Fox was at one point nominated to portray Tree Gelbman when Michael Bay was to produce.
- The theatrical trailer utilizes the song "In Da Club" by 50 Cent as Tree's birthday ringtone. However, the final film does not feature this as the crew and studio could not acquire the rights. As a result, an original ringtone composition was concocted.
- The Bayfield University Baby killer costume was designed by Tony Gardner, who also designed the Ghostface mask, the horror icon of the Scream franchise and which is a reworked version of the Father's Death Halloween costume.
- The original mascot and mask designed by Tony Gardner for the killer was a pig, a motif already done in the Saw movies.
- Director Christopher Landon tested wearing the option of a baby mask for the killer in the office and scared a worker, confirming his choice.
- During the film, Tree's full name is revealed to be Teresa.
- Tree's shirt says "Dumpstaphunk" on it. 'Dumpstaphunk' is an actual funk and jam band from New Orleans, Louisiana.
- The original script written by Scott Lobdell included material intending to make the film R-rated. Some scenes involved grislier death depictions that were entirely altered by the film's director Christopher Landon.
- Joseph Tombs was the name of the high school gym teacher of writer Scott Lobdell.
- The scenes where Tree leaves Carter's dorm room and walks through the campus quad, with the same specific events happening each time (i.e. The couple getting soaked by the sprinklers, the car alarm going off, etc.) took two days to shoot. At one point, the sprinklers malfunctioned and couldn't be turned off, costing the crew at least an hour of filming until they were finally able to fix it.
- The scene where Tree walks through the campus quad naked had to be done quickly; given that it was being filmed on an active college campus, this presented the risk of students witnessing the scene being filmed and/or taking photos. The crew took extreme precautions to clear away any potential onlookers. In the end, they managed to do just 2-3 takes.
- Happy death day was originally meant to come out in 2008, titled half to death, starring Megan Fox and to be directed by Michael Bay
- Is only the third horror film in cinematic history to be a slasher film and receive a PG-13 rating, next to The Final Girls (2015) and Prom Night (2008).
- -The mask was constructed by Tony Gardner, the same man who built the infamous "Ghostface" mask from every Scream film, and that its design was personal.
- The name "Danielle Bouseman" might be a reference to Darren Lynn Bousman, who directed three of the Saw films.
- When asked why a baby mask: Christopher Landon says he needed a combination of something that would pass for a mascot on a college campus, that was both scary and funny at the same time, plus he was expecting a son at that time, so he had "baby on the brain."
- Christopher Landon says he feels 'scary and humor' mix very well together, stating a lot of horror films take themselves too seriously and it gets depressing. He wanted this movie to be fun.
- When the killer blows up the state trooper car, this person lights the oil trail with the candle from the cupcake.
- Body Count: 8 (9 Tree Gelbman deaths).
- Tree Gelbman's birthday is repeated a total of if nine times, her last chance being the next loop in accordance with the nine lives feline theorem.
- During the climactic fight, Tree punches Lori in the throat and forces the cupcake into her mouth. A blow like that to the throat would cause the esophagus and windpipe to swell shut, rendering Lori unable to breathe or swallow the cupcake.
- Carter points out the similarities between Tree's situation and the film Groundhog Day (1993). There are in fact a few scenes that directly parallel that film's events. Just like Phil, Tree proves that she has lived through this day by correctly pointing out several events about to take place around her. One of them is a frat brother passing out, whom she helps with a pillow. This parallels a scene in GD where a kid falls out of a tree, which Phil memorized and catches in one of his errands. Phil points out that a waiter in the diner is gay, and Tree eventually finds out that Tim is gay. Her repeated unwanted encounters with Tim are similar to Phil running into Ned Ryerson. Two of Tree's deaths involve getting hit by a bus and hanging herself in a bell-tower. Two of Phil's suicides involved walking in front of a bus and throwing himself from a bell tower. Lori's last name is also Spengler, which was the name of GD director Harold Ramis' character in Ghostbusters (1984), which also paired him with Bill Murray.
- When Tree and Carter are sitting across from each other and Tree eats the cupcake, the shot mirrors the final scene of Sixteen Candles (1984), with the boy and girl sitting cross-legged across from each other in front of a window with the candle(s) on the (cup)cake burning in between them.
- An original ending featured Tree Gelbman murdered again, thus entering another time loop. The test audience reacted furiously to this ending, feeling betrayed that the protagonist, after becoming a better person, could not break free. This ending was conceived as a way of leading the viewer to believe it was never going to end.
- There are several hints that point to Lori being the killer. She is missing from Tree's birthday party during life #2. During life #3, when Tree is locked in her room, she has to look for the remote and asks herself where Lori put it. Later the killer uses the remote to control the tv. Plus it makes sense that Lori, being her room also, would be able to get in. During life #6 the killer uses a birthday candle to light the gasoline from the police car in fire and while this is not the same candle from the cupcake, the cupcake candle is red and the candle used for the police car is blue, it still points to Lori. In all lives the cupcake candle is red which could signify rage or danger.
- John Tombs is foreshadowed to be the killer as he shows up on the TV last second in one scene
- The killer uses a Blue candle to blow up the police car that Lori puts in Tree's cupcake in the beginning, hinting Lori is the killer.
- An explanation for why Tree got stuck in the time loop in the first place is never given. Director Christopher Landon said in interviews that he intends to save that explanation for a sequel.
- When asked the cause of the time loop, Christopher Landon says there is a definite reason for it; and if the viewers look closely at the film, there are easter eggs pointing to the cause - and one is really big.