Scream 4/Headscratchers

Ghostface being revealed to be Charlie and Jill. During the murders that take place at Jill's house one of the killers is seen at the Stab movie marathon and the other killer is said to be with someone else. After the murders, Sidney immediately leaves for Kirby's house where both killers already are. There's a significant amount of time before Sidney shows up, even though the killer would conceivably left around the same time, so how did the killer get to Kirby's house so fast? And who killed the cops and Kate?
- While there's been a theory of a third killer, Jill does states she was the one that killed her mother. And considering that the Kirby IM could have been a decoy, Jill had enough time to kill the cops, as well as her mother with or without Charlie's help.
  - But if Sidney and the killer leave Jill's house at roughly around the same time, why does it take Sidney so much longer to get to Kirby's house?
    - Word of God states that its supposedly to be Stu's house and also it could have taken Sidney some time there because she hadn't returned to her hometown in some time.
  - Jill actually says "My own mother had to die", not quite the same thing as "I killed my own mother." I definitely buy the 3rd killer idea though. I mean, to kill Kate and the cops, Jill or Charlie would have to be in 2 places at once and their bodies are notably smaller than that of the actors in the ghostface costume when Jill wasn't wearing it. Besides, I just don't buy that Charlie could kick down that door.
    - I agree, but maybe this Ghostface was running on virginal power... and the juice.
      - Even if so, it stil doesn't explain Olivia's death. Hoss and Perkins were in the car when Olivia got home and went up stairs. This means Charlie was already in her closet when she goes upstairs. Then, just before Olivia gets butchered, Hoss and Perkins are chasing after Ghostface running around outside, with Jill and Charlie's locations being known, (Jill in her room and Charlie killing poor Olivia) who were they chasing? I'd buy a prankster except they say something like "He's like a ghost," which implies it's actually Ghostface.
      - Hoss and Perkins little chase could've just been Trevor after his talk with Jill. He is wearing dark clothing and makes note of calling himself a ninja, so it's possible he was noticed on his way out, evaded the police, only to come back after the killer struck. "He's like a ghost" was just to throw you off. Ghost, ninja, same difference
        I buy that, but also the same thing happened in the first Scream when Sidney is attacked by someone (possibly Stu) in Ghostface attire in the bathroom. A lot of Scream is based off of misdirection really.
        I'm pretty sure the bathroom attack was a prankster. Stu was with Tatum and Billy was just outside the bathroom. Besides, we saw a ton of people running around and it's not like he evaded police officers unlike in Scream 4
In Scream 4, it is shown that the fictional movie-within-a-movie Stab 3 ended up being completed. How did the studio manage to finish the movie when most of the cast, including the director, are dead?
- They started from scratch. Stab is a Cash Cow Franchise in the Scream universe, so it's not like a little killing spree is gonna stop them -- since when has Hollywood been more concerned with good taste than box office receipts? Hell, the bloodbath surrounding the production probably turned it into a bigger hit than it would've been otherwise, judging by how it got four sequels in the following decade while, back in the real world, it took eleven years to make another Scream movie.
  - In Scream 4, they mention that only the first three films were based on fact. They started from scratch, using the events of Scream 3 as the basis for Stab 3. The "return to Woodsboro" plot originally planned for Stab 3 was abandoned in favor of the more interesting story that actually happened.
It is shown that Stab 6 actually takes place inside Stab 7 (the characters in Stab 7 are seen watching it). Does this mean that Stab 7 is actually the sixth Stab movie? Or was there a seperate Stab 6?
- The marathon was said to include "all seven" Stab movies, so presumably Stab 6 exists. The movies apparently got increasingly weird as time went on, so perhaps Stab 7 was just bizarrely meta.
- I get that Stab 7 opening with the beginning of Stab 6 was a twist to throw off viewers of Scream 4, but how would that work within the Scream universe? If anybody had seen Stab 6, they'd instantly recognize those events once Stab 7 started. Thus, it's less a twist and more just a really confusing prank to make people think they're watching Stab 6 again.
- Imagine this, you've seen Stab 6, and you watch Stab 7. The opening is either (A) the opening from Stab 6, which, if it was me, would make me take out the DVD and make sure it was the right one or (B) a different opening that claims to be Stab 6, which, because you've already seen it, you know to be fake, thus ruining the twist. Either way it doesn't work.
How on earth could Jill not even take five seconds to make sure whether Sidney was dead or not? For someone trying to be the Magnificent Bastard, they sure clutched the Idiot Ball harder than any of the previous killers.
How did they manage to have a final showdown in an ICU without anyone noticing? An ICU is staffed around the clock, with regular checks on patients. And they weren't exactly quiet.
- A deleted scene reveals that they were in a basement meeting during those scenes.