Visible crew/equipment: There is camera equipment reflected in the door window when leaving the police station. (00:36:10)
Continuity mistake: When Gale Weathers 'interviews' Sidney in the back alley, the microphone is turned at different angles between shots. (00:36:30)
Continuity mistake: When Sidney punches Gale in the face, she flies back against her cameraman that catches her putting his hand on her side under the armpit. In the next shot Kenny's hand is on the upper arm, and Gale is also already holding her cheek. (00:36:35)
Continuity mistake: Inside Tatum's bedroom, Dewey tosses Sidney an ice pack for her sore hand. Look at Rose McGowan's left hand; she's holding the plush bunny in a different spot between shots. (00:37:00)
Continuity mistake: Sidney is in Tatum's bedroom. Tatum is playing with her rabbit toy while Sidney turns the other way. Look at the notebook, pen, ice pack. Sidney doesn't do anything but a few seconds later Tatum's mom calls her and when Sidney turns towards her the objects have changed position. (00:37:10)
Continuity mistake: Sidney's right hand is in a different position in the two shots that happen when Tatum's mother tells her that there's someone at the phone for her. (00:37:30)
Continuity mistake: When Sidney tells Tatum to wait "Just a second" because she's going to talk to Gale outside school, Rose McGowan's bag has slipped off her shoulder during the take, but in the next shot she's wearing it properly. (00:39:55)
Continuity mistake: When Sidney walks towards Gale's van to talk to her the day after she socked her, she passes by the same two students in two shots. (00:40:00)
Continuity mistake: When Sidney is talking to Tatum and Stu by the lockers, the combination locks she's standing by are black in a closeup, but when a student runs past in a scream costume, she is by lockers with a pink and a turquoise colour lock. (00:40:50)
Continuity mistake: Gale realised that Cotton is innocent, and she talks about it to the cameraman. In that part of the scene, the sun is on Kenny at a different angle in different camera angles (look at the reflection of the rays in his hair and jacket). (00:41:55)
Factual error: After Gale talks to Sidney and Sidney seems doubtful of Cotton Weary's guilt, Kenny the Cameraman says to Gale, "Do you wanna go live?". Gale is an anchor/reporter for a tabloid-like show called "Top Story" (Sort of like "Current Affair", "Inside Edition", or "Hard Copy"). She does not work for CBS News or NBC News, etc. She does not have the power to "go live" and interrupt regular television programming. (00:41:55)
Continuity mistake: When some goof runs around the corridors of the school screaming, Neve Campbell's hair changes position over her shoulders between shots. (00:42:25)
Continuity mistake: Sidney bumps into Billy around the corner after she walked away from Tatum and Stu at the lockers. Behind Billy there's a short-haired student with a sleeveless striped top that turns the corner followed by a long-haired brunette. The two extras appear again in the next shot behind Sidney, taking almost 10 seconds to walk 2 meters. (00:43:00)
Audio problem: After Sidney and Billy have their fight in the hallway after he's released, the scene cuts to Mr. Himbry reprimanding two students wearing the Ghostface mask. He takes some scissors and starts to cut them up and waves the scissors around. The entire time, the scissors are making very loud, very distracting and unrealistic "SHING" sounds like metal swords sliding against each other in a hallway. These scissors simply would not make such obnoxious sounds with the simple movements he's doing with them. They even make the sound as he's cutting through the mask, which if anything would have muffled the sounds they made even more. (00:44:50)
Continuity mistake: Mr. Himbry calls the two expelled students "Desensitized little sh*ts", pointing the open scissors at him. In the next shot he's looking at him but he changed position, since the scissors are gone from frame. (00:45:20)
Continuity mistake: When Sidney is in the bathroom at school, the trash on the floor around the trashcan changes. (00:45:25)
Continuity mistake: During the whole bathroom scene the trash bin by the exit door is oriented parallel to the wall or perpendicular. The mistake can already be spotted early in the scene when the cheerleader is berating Sidney, but it is much easier to notice it at the very end not just because there are multiple consecutive shots from different angles, but also because to make possible for Sid to collide with the bin as she slides across the floor, the bin has been placed almost two feet away from the wall. (00:46:30)
Continuity mistake: 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. (00:48:40)
Continuity mistake: When Dewey says "I'm 25 years old" to Gale, three people are coming down the stairs behind him. Next shot and they already went way past Gale. Same in the closing part of the scene as she says "Please, call me Gale!" and the guy above Dewey who is going up the stairs passes her by. (00:48:55 - 00:50:15)
Continuity mistake: When the principal comes back into his office after checking out who was knocking on his door you can see a closet in the background with coats in it. When they change the angle the jackets have moved to a different position. (00:50:35)
Answer: Landline phones like the one used in the movie cannot dial out a phone number while the line is active. Considering the killer is continuously calling her, she can't dial out on the phone line. This is referenced in the movie itself when her parents arrive home, attempt to dial 911, and can't due to the line still being active.