Corrected entry: When Sidney is waiting for her friend, it's 7:15 and it's dark out. But later, all the stores are closing because of a 9:00 curfew, and it's light as day.
Corrected entry: When Ghostface stabs Mr. Himbry, the man screams at full lungs; it's 10 minutes to 5 PM and there's a janitor two rooms away, but nobody finds his body until much later in the night - and that is critical to the plan, because he's the designated diversion.
Correction: Actually, I can correct myself here because there is the fact that everyone was leaving the school at that time, and the janitor is hard of hearing. It does not make much sense that we see the two culprits hanging out at the video store after the killing, but I suppose there are several scenarios one can paint where the body was hidden safely until it was time to display it later in the night, and so they had time to show up somewhere else later, not knowing the exact timeline there.
I was just watching a video where they talk about how it's now a trope in movies that janitors are completely oblivious to their surroundings. Big action sequences happen behind them while they listen to headphones and go about their jobs. You said the janitor was hard of hearing, but it could also be this trope at play.
Corrected entry: When 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.
Correction: This scene is wrong. When Randy answers the phone, he is on his knees when he says hello then stands up. Therefore, the video camera under the TV recorded his position accurately.
Corrected entry: At the video store, when Stu knocks the movies out of Randy's hands, when they hit the floor it makes a hollow sound, indicating empty boxes.
Correction: Video stories did not put movie boxes on the shelves with the movies in them. You had to take the box to the front counter to actually receive the video.
Corrected entry: 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?
Correction: Just because the last scene started at sunrise doesn't mean that's when the police just got there. They could have been there for hours before hand, shortly after Billy was killed. It sometimes takes the police 1/2 hour to an hour to get somewhere, so they were probably there shortly between the second to last and the last scene. Also, the call Sidney made in the car may not have officially gone through.
Corrected entry: When Casey is looking outside at a tied-up Steve while on the phone with the killer, her hair is hanging over the phone. Cut to the scene of Steve, then back to Casey and her hair is pushed behind her ear. Back to Steve, then back to Casey again - her hair is hanging over the phone again.
Corrected entry: In the garage, Tatum can't escape because the killer locked the door. But once Tatum's killed, the killer leaves the garage without unlocking the door. (01:02:35)
Correction: Tatum walks into the garage, leaving the garage door wide open. The killer then slowly closes the door and locks it. Tatum tries to open the locked door, then opens the outside garage door. Tatum walks over to see the door open half-way, then close, and turns to see the killer in front of the, now unlocked, garage door. Even though the killer is wearing a GhostFace mask, I doubt he can walk through a closed and locked door.
The problem here is Tatum attempts to open the door a second time, mid-fight with Ghostface, and it's still locked. She then turns around and throws some bottles at him before beginning to crawl through the doggy door opening. Then Ghostface casually opens the door without unlocking it. The only explanation I can come up with is if he has a key to the door and unlocks it off-screen as she is being killed.
Corrected entry: In the scene where Dewey and Gale are entering the house where the party takes place he talks to Sidney and says anything like "Hey Sidney" and she replies something like "Anything new about my father?". This is really strange because Dewey dropped Sidney and Tatum at the party about only 5 minutes ago. The conversation gives the impression that they have not talked to each other for a much longer time.
Correction: The reason she asks about her father is BECAUSE Dewey dropped them off five minutes earlier. He drops them off, then leaves (at least, Sidney thinks he leaves), and so when she sees him returning so soon she assumes some urgent news has come up.
She just saw him arrive being Gale Weathers' chaperone and acting all smarmy, if anything you could argue that she's being passive aggressive asking "Have you found my father?" (because that is the actual quote), as in "Why are you wasting time here then?" but that's not how the scene plays out either. The dialogue feels pointless and forced as the original entry described, in particular because she then asks "Should I be worried?", which is definitely a question that does not match the context.
Corrected entry: When Gale and Kenny are watching the "Rules" speech on the delayed tape, you hear Randy say "There are certain rules..etc." and when Randy said this he was standing by the TV. Then Dewey comes and knocks on the camera van, and you see Kenny turn off the tape. But when he turns it off, you can briefly see the tape, and Randy is sitting on the couch watching Halloween, when he should have been standing, explaining the rules, as you never see Kenny or Gale rewind the tape. (01:10:55)
Correction: This is because, as you've already correctly stated, there is about a 30 second delay on the tape that Kenny and Gale are watching. When Dewey knocks on their van's door, the tape has yet to show Randy standing up and doing his horror movie speech.
Correction: You can hear Randy explaining the rules a few seconds before Dewey bangs on the van door.
Corrected entry: When Kenny is killed, the bag of crisps he was eating are standing up on the side. But when Gale is trying to find Kenny, and looks in the van, the bag of crisps are now laying down on the side, tucked under a shelf. (01:20:15 - 01:22:05)
Correction: There is a long interval between the time Kenny dies and when Gale arrives. After Syd leaves the killer is left alone in the van. When that happened he spread blood all over the van and lay Kenny on top of it. During that time he could have decided to move the crisp packet or even to eat the crisps and then discard the packet under the shelf.
Corrected entry: 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.
Correction: 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.
Corrected entry: During the showdown in the kitchen, Billy and Stu are stabbing each other in the side. Billy gets knife happy and starts stabbing Stu too much, but only in his side. Then when Billy tells Stu to get the gun, Stu turns around and and has a wound on his upper back with lots of blood, but there is no way that could have got there.
Correction: Billy has the knife and stabs Stu; the camera then cuts to a close up of Sidney's face and there are three more stabbing sounds, but we don't see where they are. Billy could have stabbed Stu in the back off screen.
Correction: In the unrated version you see the extra 3 stabs, they are all in his arm and chest, nothing in his back.
Corrected entry: When Sidney and Ghost face are fighting in her living room he knocks her down and is sitting on top of her. Ghost face grabs her by the hair and appears to headbutt her and pull her hair and slam the back of her head on the floor at the same time. She then puts her hand on her forehead.
Corrected entry: When Billy, Sidney, and Stu are in the kitchen, Billy licks the blood on his fingers and says "Corn syrup. The same thing they used for pigs' blood in Carrie." However, after Sidney and Stu had sex earlier, there is no way Billy would have had time to smear corn syrup on himself while being stabbed by Ghostface (Stu). We don't see him rub anything on himself. He couldn't have been wearing a packet of fake blood, because Sidney would have noticed it while they were taking off their clothes.
Correction: He could have had blood caps in his pockets. The same blood caps are being used in Halloween parties for making blood come out of your mouth.
Corrected entry: When you see Sidney's dad tied up on the floor just in front you see Stu's bloody hand and you hear dripping blood but you don't see any blood dripping. (01:32:20)
Correction: Although the scene might suggest the blood dripping from Stu's hand, it is not impossible that it is dripping from another bodypart (i.e. his belly) as he has just been stabbed multiple times and is losing a lot of blood.
There was suppose to be blood dripping from his hands but they cut it.
Corrected entry: In the scene where Drew Barrymore is talking to the killer when he has just rang the doorbell, if you look out the window, you can clearly see that her boyfriend is out there talking to the killer.
Corrected entry: When Sidney goes back into Stu's house after the killer tried to catch her in Dewey's car, she takes the gun out of Dewey's holster. The ends of her hair are wet with blood. But after she discovers that Billy is still alive after being stabbed, she goes over to him to help him up. The ends of her hair are completely dry.
Correction: So the blood coagulated, which only takes a short while.
Corrected entry: When Sid is going back to the house, after being thrown from the window, Randy is limping towards her saying that they have to get out of there. Why is he limping? Gale hit him in the face, but no one touched his leg.
Correction: Maybe he twisted his ankle when he fell over from being hit with the phone.
Corrected entry: In the scene in Stu's kitchen at the end, when Billy has just been stabbed by Stu, Stu gives him the knife and is saying to Syd, "Everybody lives but us." When he says that they'll live because they have to plan the sequel, he is gesturing with his hands, with his pointer fingers pointed up. As he's saying, "'Cause let's face it baby, these days, you gotta have a sequel," his hands go in and out of the frame four times. Just as he says "these days," he has his middle finger up on his left hand instead of his pointer finger. Obviously deliberate on the actor's part, but pretty funny.
Correction: Everyone's closing their shops to get home before curfew. The shop owners and their employees need time to count money, clean up, maybe collect children from babysitters, etc. Most likely, as Syd referenced during that scene, people want to get home before sundown. I know I would if a serial killer was on the loose.