Visible crew/equipment: At the end when Sidney's dad falls out of the closet, if you look closely you can see the hands of a crewmember who was in there too, pushing items out after him. (01:42:40)
Trivia: When Henry Winkler is looking for the "kids" that keep knocking on his door, he opens one door and surprises a cleaner. The cleaner is dressed like Freddy Krueger, is called Fred, and is played by Wes Craven himself. (00:49:55)
Continuity mistake: 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. (01:04:20)
Revealing mistake: When the killer surprises Sid 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 Sid 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. (00:27:55)
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: After the curfew has taken effect, Dewey and Sheriff Burke are standing on a sidewalk in town. The Sheriff is smoking a cigarette. In one shot the cigarette is almost gone, then he drops it and he steps on it, but it's now a lot longer. (00:59:40)
Continuity mistake: 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. (00:01:25 - 00:03:30)
Continuity mistake: In the final scene where Sidney gives the "coup de grace" to Billy shooting him in the head after he suddenly woke up, he holds the left arm above the mask on his top left, but when he dies, his arm is lowered and the knife appears from nowhere. (01:42:30)
Continuity mistake: At the beginning of the film, Casey is cooking popcorn on the stove. When she peels the top off, you see her peel the side away from the handle, and she's using her left hand, but when the shot changes, she's using her right hand, and is pulling from the other side. (00:01:15)
Continuity mistake: 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. (01:05:35)
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: At the beginning of the movie as Ghostface chases Drew Barrymore the killer is wearing a different style of mask and even has a shiny silver material rather than black. As the killer then sits on top of her then choking her, it is the more recognisable mask.
Answer: Characters in horror movies are notorious for not doing the most obvious things. It's most likely that she was scared and not thinking straight at receiving numerous threatening phone calls, particularly when she is threatened after hanging up on the killer.
Manky
Also, when she told the caller that she was "two seconds away from calling the police", his response was that they'd never make it in time. She also knew he was nearby as he made comments that indicated he could see her. She didn't know it was someone that knew her. She's a teenager and scared, so her judgement was clouded. She reached a point where she believed her only chance was to get away from him by either fighting him or getting out and hiding somewhere outside.
dewinela