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Happy Birthdead (2017) Poster

Trivia

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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 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.
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.
Director Christopher Landon tested wearing the option of a baby mask for the killer in the office and scared a worker, confirming his choice.
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.
Originally titled "Half to Death."
The original mascot and mask designed by Tony Gardner for the killer was a pig, a motif already done in the Saw movies.
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 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.
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.
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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."
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Tree's shirt says "Dumpstaphunk" on it. 'Dumpstaphunk' is an actual funk and jam band from New Orleans, Louisiana.
The name "Danielle Bouseman" might be a reference to Darren Lynn Bousman, who directed three of the Saw films.
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During the film, Tree's full name is revealed to be Teresa.
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Joseph Tombs was the name of the high school gym teacher of writer Scott Lobdell.
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Spoilers 

The trivia items below may give away important plot points.

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.
Carter points out the similarities between Tree's situation and the film Un jour sans fin (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 S.O.S. fantômes (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 Seize bougies pour Sam (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.
Body Count: 8 (9 Tree Gelbman deaths).
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.
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.
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.
In the scene where Tree is locked in the cop car, and the masked killer ignites the gasoline trail, you can see that it is lit with the birthday candle that was on her cupcake.
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