Audio problem: When Sidney comes running to the house and she sees Dewey come out with the knife in his back she screams "Dewey!" but her mouth says "no!"

Revealing: As Drew Barrymore is running from the killer outside he stabs her.  If you look closely it is very easy to tell it is a rubber knife, because you see it bend off of her.

Continuity: When Ghostface is trying to kill Tatum in the garage, she tries to go through the doggie door. From the outside shot, she is out of the door from her arms and up. From the inside shot, she is out of the door from her hips and up.

Deliberate "mistake": When Randy is explaining the "rules" and he is standing beside the television the batteries fall out of the remote yet he still manages to change the TV over.

Audio problem: When Gale is talking to Kenny the cameraman before she goes off to investigate the abandoned car with Dewey her face is in a close up. She can be clearly heard uttering the forbidden phrase "I'll be right back." However her mouth can clearly be seen saying "keep watching."

Continuity: As Gale is talking to Dewey outside the school, when she is trying to get information from him about the killings, Dewey takes his sunglasses off and hangs them on his shirt. In the following scene they hang two different ways every time the camera cuts to him.

Continuity: When Henry Winkler opens his door to look for the "kids" that keep knocking, you can see red writing on the wall opposite. When he comes back in from checking out the hallways, that writing is gone.

Continuity: After Sidney has been attacked and is in her room.  Billy climbs through the open window. It is completely open. After he drops his mobile phone, the window is only half open.

Revealing: When the killer surprises Syd after she's come in from outside and locked the door, he tries to stab her with his left hand, misses, and hits the door right next to the chain in closeup. In wide shot (very quick shot) when Syd legs it, look at the killer and you can see he's holding a very badly bent knife in his right hand, nowhere near the chain.

Continuity: After the curfew has taken effect, Dewey and his Sergeant are standing on a sidewalk in town.  The Sergeant is smoking a cigarette.  In one scene, the cigarette is almost gone, then he drops it and he steps on it, but it's almost an entire cigarette.

Continuity: At the very end, when Sid finds out who the killers are, they are all standing in the kitchen. When Billy and Stu stab each other take a look at the blood stain on the left side of Stu's jumper. It starts around his shoulder and vertically goes down towards his waist. When Sid is fighting him in the lounge she gets up and goes behind the TV. In the shot looking straight down on Stu from a birds eye view, notice the blood stain is now horizontally across his stomach. You'll have to look closely for this one.

Factual error: When Sydney is in the police car, she picks up the radio and tells the police that somebody is trying to kill them. Not only does she give the name of the homeowners and the address, but she is attacked in the middle of her conversation, and screams. A few minutes later, Billy grabs her and says that it is a few minutes after midnight, exactly one year after they killed her mother. However, the police don't show until sunrise. What happened in the six hours?

Revealing: When Sidney and Stu are fighting in the living room and they both trip over the couch, Stu's stunt double is visible and wearing a wig.

Continuity: When Stu & Billy are in the kitchen after Sydney has escaped them, she calls Stu's house phone. Billy gets pissed and throws the receiver at Stu. It bounces off him and lands on the floor, yet when Stu picks up the receiver to talk to Sydney, it's on the table.

Continuity: Casey's lipstick changes colour throughout the scene.

Continuity: When Casey is making popcorn, firstly the top of the popcorn that she tears off and places next to the stove changes from being folded in half, to later on laying down flat. Secondly Casey picks up a salt shaker and places it by the stove, but this later disappears.

Audio problem: When Gale starts driving away after she hits Randy with the phone, Kenny's body falls on her windshield. At this part the camera pans to a shot overhead and Gale says "Kenny, I'm sorry, but get off my f***ing windshield!". Her mouth is not moving as she says this.

Continuity: At the end of the movie when Stu and Sidney begin tumbling (right before he gets killed) there is a bench in the background with a bag of ruffle potato chips facing upwards, in the next shot it is lying down.

Visible crew/equipment: There is camera equipment reflected in the door window when leaving the police station.

Audio problem: When Tatum throws the first beer bottle at the killer, she yells out, "F***er," but her mouth doesn't move.