As a Fridge subpage, all spoilers are unmarked as per policy. You Have Been Warned.
Fridge Brilliance:
- Billy, after Sidney asks for a motive, states that Norman Bates didn't have a motive. Though many chalk it up as a mistake on either Kevin Williamson's part, or even on Billy's part in-character and serving to show he's not as Genre Savvy as he thinks, it is actually Fridge Brilliance when you take into account that Norman Bates himself doesn't have a motive. Mother is the killer in the films, and she has the motive. Fans of the film series, though they know the twist about Norman and Mother, treat Mother and Norman as separate people (much like how Mother and Norman are treated in the actual book the film is based on). So, Billy is technically right, as Norman never killed anyone.
- In his phone call with Casey, he takes advantage of the fact that the killer in Friday the 13th was ALSO actually the mother of the franchise's best-known villain.
- In-universe, the Ghostface costume is called Father Death, alluding to the Grim Reaper. But the mask doesn't look like a skull, it's, well, a ghost... UNTIL, you look at the "nose" of the mask, which resembles the nose hole of a human skull.
- Why don't Stu and Billy bring up ambushing Sidney in the school bathroom? Because it wasn't either of them, it was another prankster. They had no knife and made no attempt to chase her after she ran out.
- Principal Himbry's murder, even with the knowledge that his body would be used as a distraction to draw the remaining partygoers out of Stu's house, seems a little random and out-of-place... which it was. Billy and Stu had no way of knowing that classes would be cancelled, and if their original plans revolved around keeping an eye on Sidney during the school day, they would need something new. The party would be a great way to get her there without arousing suspicion, and the principal was a figure whose death would evoke a reaction from most of the student body. The showdown taking place at one of their homes was unlikely to have been originally planned, since the police investigation after-the-fact might have uncovered evidence that directly contradicted their planned story of Neil Prescott being the killer.
- During the final showdown, Billy and Stu make several stupid decisions - not keeping an eye on the gun, stabbing themselves before finishing off Sidney - that go against their image of competent killers who were smart enough to give themselves alibis for all the murders. Then it makes sense when you consider that the entire movie takes place over four days:
- Night One: Casey and Steve are murdered. Billy and Stu visit their girlfriends. Also, they kidnap Neil Prescott.
- Day One: The students find out about it and see grief counsellors.
- Night Two: Ghostface (Stu) tries to kill Sidney before retreating to let Billy get arrested. Stu then calls Sidney.
- Day Two: Billy gets out of prison and kills the principal, hanging his body from a goalpost while Stu prepares for the party.
- Night Three: The final showdown takes place, with Billy and Stu running around a lot to kill Tatum, Kenny, and trying to kill Sidney.
- Day Four: Billy and Stu revel in that they killed Maureen a year ago today, in which they are killed in return. Gale then reports on her exclusive eyewitness encounter at daybreak.
- By the time they had cornered Sidney in the kitchen, they were probably exhausted from almost a quarter of a week's worth of running around killing people and not getting enough sleep. It would be more surprising if they were thinking clearly.
Fridge Horror:
- Stu's final words—"I always had a thing for you, Sid"—aren't just an admission of a schoolboy crush, they imply that like many serial killers, he gets sexual gratification from his murders.
