Continuity mistake: When Sidney is first going into the house for the end of the movie it is clear that she is not wearing the vest underneath her clothes and as she is walking around or when she is rolling on the ground fighting with her half brother you see her bellybutton but then she has the vest on and it goes over the belly button

Scream 3 (2000)
Plot summary
Directed by: Wes Craven
Starring: Beth Toussaint, Courteney Cox, David Arquette, Emily Mortimer, Jenny McCarthy, Kelly Rutherford, Lance Henriksen, Liev Schreiber, Neve Campbell, Patrick Dempsey, Roger Jackson
Sidney is hibernating in the woods, her whereabouts unbeknownst to everyone but Dewey. After a number of murders that seem to be related to the Woodsboro case take place on the set of Stab 3, Sid comes to Hollywood to be terrorized, find out more about her mother's death, and put together the final pieces of the Scream mystery.
Sidney: Hey Detective, what's your favorite scary movie?
Mark: My life.
Sidney: Mine too.
Trivia: Kevin Williamson (who had written the first two films, as well as the fourth) had an entirely different plot in mind, which he had outlined and given to the studio, only for it to be passed on. His original concept had the killers in the film be members of a "Stab" (the film-within-the-film) fan-club, who orchestrated the murders in order to gain fame and become heirs to Sidney Prescott's status as the soul-survivor. Aspects of this unused original story treatment were re-written into the fourth film, which features a killer whose motivation is fame and becoming the soul-survivor.
Question: Is there any significance to the code '1288' Sydney uses at her mountain hideaway?
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Answer: Not expressly, though it could have been the date of some significant event (December of 1988) but someone as security-conscious as Sydney now is wouldn't be stupid enough to have her code be something that could be guessed.