Continuity: When Casey puts the two videos on top of the TV, she puts them on top of each other so they are placed neatly. Then when she picks up the letter opener off the TV later, the videos are no longer stacked neatly.

Continuity: When Tatum goes into the garage before she gets killed,she goes to get beer. She then walks over to the garage door opener with the beer in her right hand. Her left hand is reaching up to push the button, but as they show the close up, it is her right hand pushing the button.

Continuity: When all the guys are sat outside of the school talking about who (a male or a female) is the murderer, Tatum's leg is behind Stu's leg. In that same action, we go to a close up and suddenly Tatum's leg is in front of Stu's leg.

Continuity: In the scene where Tatum gets closed in the garage door, the first time it shows her arm hanging down. In the next scene, it shows her arm caught in the door.

Continuity: When Sidney and Billy go upstairs to 'talk', Randy says "I think I'll go check on them" and heads for the stairs. In the next scene he's on the couch. What happened?

Deliberate "mistake": When Sidney is typing the message to the police, you can see that there are red lights flashing, which must mean the police are there, 5 seconds after she types. Obviously deliberately done for the humor.

Continuity: In the scene where Randy answers the phone at the party and learns that Principal Himbry is dead, his face is very close to the top of the TV screen. However, when Gale and Kenny are watching the recording of the phone conversation in the van, Randy's mouth and nose are directly in front of the camera. The camera that Gale placed in the entertainment center when she first got to the party was situated on top of the VCR, which was in turn placed on a shelf below the actual TV; therefore, Randy's mouth and nose should not have been visible on the recording. If anything, only his waist should have been visible.

Continuity: How come everyone including Randy had their jackets on and appeared to be leaving the party and yet Randy was the only one left at the party at the end, before the bloodbath? The answer to this spawns another goof itself: Randy said he'd stay behind to check on Billy and Sydney, which is why he didn't leave. However, the goof is that he didn't actually go upstairs to check at any time, because he'd either have seen them having sex, or else found Billy's body. Of course, another explanation is that we're made to think that Randy must be the killer, because he's the only one who stayed behind. We just don't know.....

Revealing: When they shoot the killer at the end, the hole in his head is there before the gun goes off. You can see the hole in his head for about a frame before the flash of the gun goes off and his head drops. The body is also clearly a dummy. The scene then cuts and they show him being shot again. Once more, the wound is already there.

Visible crew/equipment: Look closely (you may need widescreen to see it) at the railing when Sidney is walking up the stair outside while talking to Tatum. You'll notice a boom shadow.

Other: When Sidney is preparing to go to Tatum's house, she brings several items of clothing downstairs, including a pair of boots, which seem to be knee-length from the way she is holding them to her chest. However later when she is dressing after her session of nooky with Billy, the boots have changed to ankle length. [The clothes that Sidney packed were in the house and she never got them since she left the house after she was attacked and besides the day that she made nooky with Billy was a different day then the day she was attacked.]

Continuity: After Courtney Cox runs to the van when she's being chased, she hops into the van and throws it into reverse, guns it, then slams on the brakes, and the body falls down onto the windshield. Slamming on the brakes after going in reverse would cause the body to fall the other way, toward the back of the van.

Continuity: When Randy answers the phone he kneels down putting his head about level with the top of the TV, yet when Sidney goes to drop the TV on Stu's head the TV is much higher.

Continuity: When Sidney and Kenny are watching the tape of the van from inside the party, the scene they are watching, and what actually took place of Randy describing the "rules", there are many differences in what the people say and do.

Continuity: In the scene when Sidney and Billy are talking in the bedroom at Stu's house, when the camera is on Billy, Sidney's hair is in a different position than when the camera is on her.

Continuity: At the end when Sidney is in Dewey's police car and the killer is there, she opens the door and falls out but the door is still locked. In some cars you can open the door when it is locked but the lock always pops up after you open the door, and this one didn't.

Continuity: When the cameraman is watching the 30 second delay footage and the ghost face is about to kill Randy who is on the sofa, he walks into the room in a different way on the delayed footage to on the actual film footage.

Revealing: When the killer first stabs Casey, whilst chasing her outside, you can see that as the killer grabs her, some of Drew Barrymore's real hair fall out from under her wig.

Continuity: When Dewey enters the house where the party was held, calling out for Mr. Prescott and holding his gun, he passes a table with a vase on it. If you look closely, you'll see the table and vase are knocked by someone off-screen twice, Dewey (David Arquette), is nowhere near it.

Continuity: In the opening scene, Drew Barrymore put the Jiffy Pop on and it sizzled right away. In reality, it takes about ten minutes to heat up. And also she should have shaken it when it started sizzling.