Deliberate mistake: In the final shot of the film, Jill's head moves slightly when she's supposed to be dead. In the commentary, Wes Craven confirmed this wasn't strictly intentional, but he decided to leave the take in on purpose in case he decided to bring her back in a future installment. But unless a sequel proves she's still alive, it's technically a mistake, albeit a deliberate one.

Scream 4 (2011)
1 deliberate mistake
Directed by: Wes Craven
Starring: Courteney Cox, David Arquette, Neve Campbell, Lucy Hale
Continuity mistake: In the scene where Jill and Charlie are revealed as the killers, Jill is holding a knife to Sidney's throat and a gun in her left hand as she explains her motive. When Jill and Charlie are getting ready to stab each other, the shot changes and Charlie hands Jill the knife, even though she just had it in her hand pointing it at Sidney. (01:11:20)
Sheriff Dewey Riley: One generation's tragedy is the next one's joke.
Trivia: While the film is primarily written by "Scream" and "Scream 2" writer Kevin Williamson, due to a hectic production schedule, "Scream 3" writer Ehren Kruger was brought on to do some last-minute rewrites during filming. However, Kruger chose to go uncredited, as he mainly worked on "polishing up" scenes originally written by Williamson.
Question: When Jill and Kirby were watching "Shaun of the Dead", and Ghostface calls them, how did he know they were watching that?
Answer: Also, pretty sure they told Olivia over the phone what they were watching and Ghostface was in the closet listening.
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Answer: Remember that Jill and Charlie were the killers and were working together. Therefore, Jill probably told Charlie the film they were planning on watching. Meaning when he called Kirby he knew what she and Jill were watching, which makes the killer more sinister and omnipresent.