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)

Scream 4 (2011)
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Directed by: Wes Craven
Starring: Courteney Cox, David Arquette, Neve Campbell, Lucy Hale
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Rachel: A fucking 'Facebook' killer... You're kidding me right?
Chloe: I guess now it would be Twitter, that'd make more sense.
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.