Continuity mistake: Roman's sideburns change lengths towards the end of the movie.
Continuity mistake: Jennifer's house, the door just opened on its own. For some reason, Angelina and Tom don't shout back at Dewey and ask what's up, but rather jumpscare him. With Dewey's gun pointed at him, Tom has both hands in the air. In the same shot he lowers the right hand, but in the next he's with both hands up again. (00:43:20)
Audio problem: To dispel Jennifer's suspicions that he's still in love with Gale, Dewey adds that Gale is cruel, etc. David Arquette's lips are not moving, though. Noticed also by the crew on the DVD commentary track. (00:39:40)
Continuity mistake: Look at the shirt David Arquette is wearing when he's out at lunch with Gale, heading then to Jennifer's house for the first time. They learn about Sarah's murder and head to the crime scene, and Arquette is wearing a different shirt he'll wear for the party later. Admitted by Wes Craven himself in the DVD commentary track. (00:33:40)
Continuity mistake: When at the diner's Gale answers "Well, I have written the definitive book about the Woodsboro murders", her arms are open; her hands were joined earlier. (00:28:30)
Continuity mistake: When fake-Gale mentions "your private self-loathing", an extra exits the frame to the left side. Over five seconds pass before the extra walks into another shot of the dialogue. And there she is again, but this time redoing her walk from the beginning, when Dewey embarrassed repeats "Little girl inside." (00:17:05)
Continuity mistake: Jennifer is reading the fax page using her flashlight; without moving her hand, she holds the sheet by the top corner at first, then in the bottom half. (00:44:25)
Continuity mistake: Stone falls face down in front of the entrance, his arms raised forming (very roughly) right angles. When Dewey screams to the others to get inside, Stone's left-hand touches his head. (00:43:45)
Continuity mistake: Steven Stone picks a few coins from Dewey's counter. You can see that there are 5 left in the wide shot, but only 4 in close-up. (00:42:10)
Continuity mistake: Confronted by the cops, the director says "I did not call Sarah Darling." In the background, look at the dark-haired extra that joins the other two by some stage equipment. A couple of cuts later she's just walking by them. (00:35:10)
Continuity mistake: When the cops go talk with Roman to ask him about his meeting with Sarah Darling, you can notice that Jennifer's bodyguard grew longer sideburns in the space of minutes since the scene at the house. Noticed by producer Marianne Maddalena on the DVD commentary track, and apparently they had some talks on set about that. (00:35:00)
Continuity mistake: After the scene with Posh Spice's former bodyguard giving 'Dewdrop' a piece of his mind, we see the detectives at work. The hands in close-up hold one of the photos by the bottom, but in the wider angle detective Wallace is holding them by the sides. (00:33:45)
Continuity mistake: Sarah is trying to fix Roman's statue with some tape. She does it holding the statue the exact opposite way in the two camera angles. (00:24:35)
Continuity mistake: After her dad visited her bringing her the essential dose of squashes, Sidney is sleeping on the couch. To get to her, the camera pans across a side table where there's a headset in front of a photo of Sid and her mom. Close-up on the photo, and the headset changed position as you can see from the colorful book it is resting on. (00:20:40 - 00:22:00)
Continuity mistake: When Gale stumbles into Dewey for the first time, the camera is behind her and as he mutters "Gale" you can see her shoulder, which is clear from any hair. Next view, and her shoulder is a big messy wig salad. (00:16:40)
Continuity mistake: Gale Weathers just finished her speech, and David Arquette's brother in the audience asks her a question. Of course, they are out of time, and he's silenced with applause. People start leaving their seats, but the people standing don't match in the reverse shot. (00:11:55)
Other mistake: Ghostface has a strength that rivals a superhero. He's trapped under a bookshelf but not only gets free in a second; the mere gesture of freeing himself sends a grown, bigger man flying and tumbling over a desk. Seriously, from the angle it appears that the case hit Cotton in the side of the head, but that would never propel him over furniture as shown. His body also twists counterclockwise when bumped and clockwise on the desk. (00:09:00)
Continuity mistake: For a moment, Cotton seems to have the upper hand against Ghostface as he pushes a bookcase on him. He eyes the golf club trying to take it back; in two consecutive shots though, you can see a Vance Bourjaily book (it should be "Now Playing at Canterbury" but you can only see the back cover) that faces opposite directions. (00:09:00)
Continuity mistake: The detective gives Gale the picture that she identifies; her thumb is in a different spot in each shot. (00:12:30)
Continuity mistake: Detective Kinkaid tells Gale "I'm here because Cotton Weary's been murdered." Behind him in the corridor, a girl that was at the conference, in overals and a loud pink top. Reaction shot on Gale, and in the background, in a different corridor, the familiar denim-and-pink-girl. (00:12:20)
Answer: No it was Roman. There is a technique you can do where if you apply pressure on the correct artery you can stop the pulse. EXTREMELY dangerous though.