The reveal of the killer was such a WTF!? and surprise. Not once during the movie did I possibly think it could be her, only when Ghostface was about to reveal themself did I think, "Well... is it gonna be 2 guys again as the killer? Where the f***'s Jill or Tr... *reveal* What the f***!"

That's what Scream is all about. Charlie was still a bit of a surprise in a way, because I was always looking at how tall and strong the killer was. So I ruled out Charlie's friend right off the bat, and Charlie himself was pretty small, so pretty interesting that he could brutalize Olivia like that, and with boots on gain 5-6 inches or so
At one point, I remember telling myself, I don't see how the hell the killer could NOT be Trevor, but I was thinking man, there's no way their gonna make it that easy for us. He's got killer written on his forehead but their probably just ****ing with us. I felt so bad when he got shot in the ***k. That sucked, then the head. That's like a double whammy. Then again, I hate up close & personal gun violence like that, but that made me cringe with that second shot. The first one made my balls ask for a brown bag to breathe out of.
I think at first, when hearing Jill's motive, I was thrown off because it seemed silly and didn't make sense. But when she was being wheeled off on a gurney and had all those reporters in her face it started becoming more clearer, "Ohh this b***h is just crazy for that kindof attention." Or maybe I was still just shocked that Jill was the killer.
Overall, a very fun and good movie. I was under the impression too that it was gonna be a new cast like they teased at, but they threw us quite a curveball.
Also some things that stood out to me off the top of my head.. -
How did Gale not get shot by Jill when she got electrocuted with the defibrillator? I'm sure that shock would've pulled the trigger 
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Was it just me, or were the knives used in this movie like twice as big as the knives the killers used in previous movies? - I wanted to hear Gale say that "Go on, if you've got the guts!" when she got stabbed, I thought it would be very badass, considering she's been through so much of that before - Same with the fountain scene that was cut - Ghostface is the quickest motherf**ker alive! When he escaped the house after getting kicked in the face by Sid, then the cops storm in "Where is he!?" Looney Tunes speed out the door.