Factual error: The movie theater ticker says it's Monday, April 12th, 1997 - but the 12th was on a Saturday. (00:00:20)
Other mistake: When Gale and Dewey are being naughty in the VCR room, Gale spots some of the footage the killers took of the victims. One of the clips features Maureen and Phil in line in front of the cinema, but not only the shot is basically an impossible one since it's shot from a car and in the whole scene there were no cars in the street, but also the movements of the two actors are entirely different from the ones in the opening scene during that line about "a bio." (00:00:25 - 01:18:05)
Other mistake: In the beginning of the film above the box office the date says April 12. When Sidney looks at her watch the next morning it's not even close to that date. (00:00:35 - 00:12:55)
Suggested correction: The mistake is correct, but the watch part has nothing to do with the incorrect date. It is the next day.
Continuity mistake: In the opening scene, the position of the bag straps and tee-shirt straps on Maureen's shoulders keep on changing. (00:00:55)
Continuity mistake: When Phil and Maureen enter the cinema, Phil puts his arm around Maureen's shoulder. But in the next shot his hand is placed on her back instead. (00:01:40)
Continuity mistake: When Maureen and Phil arrive in the theater, immediately at the beginning before the camera even gets fully in focus you can see by the door a blonde girl putting on the Ghostface hood, with her partner helping her. The camera cuts away for a second, and in the next wide shot you see her repeating the gesture. (00:01:40)
Continuity mistake: When Phil and Maureen get inside the cinema and sit down, Maureen removes her bag from her shoulders. But in a following shot of her, you can see the bag straps back on her shoulders ("You see your boyfriend anywhere?"). (00:04:10)
Other mistake: Maureen gets popcorn and a coke, yet doesn't pay for it. Nor does the cashier ask for money. (00:04:45)
Suggested correction: To be fair, she asked her boyfriend for some money, he gave her a note, which she holds in hand in that scene making her order and, almost certainly if we go by the arm movements, puts on the counter. If what she ordered required no change, nothing more was needed in the exchange. It's not as if she just went to the counter, didn't have any money with her, was fully on camera all the time and got her order sorted.
Continuity mistake: In the beginning of the movie, Jada Pinkett orders a popcorn and a small Pepsi from the concession stand. As she walks back in to the theatre she clearly has a jumbo sized large. (00:05:20)
Continuity mistake: In the opening scene - the premiere of Stab - when the girl is about to go back into the theater, you see the door into the theater. In the next clip, when she enters - the door is much wider. (00:06:20)
Continuity mistake: When Maureen goes back to her seat and starts putting on her jacket, the dude at her side begins waving his arm super-enthusiastically making happy coos. She finishes putting her jacket on and the guy, who is still making those sounds in dub, is sitting composed. (00:07:05)
Plot hole: It is highly unlikely that the murderer knew Phil was going to put his ear to the stall when he heard the babbling. It is even more unlikely that the murderer is going to get him on the first stab through the stall. (Which also requires a lot of strength). We also have to assume that he spent time hanging out in the bathroom knowing Phil would go there to begin with, and that other two men with weak bladders were doing the same simultaneously forcing the victim to go to the stall to begin with. (00:07:45)
Suggested correction: The killer is incoherently whispering in a strange way in the adjacent stall to lure Phil to press his ear up against it. After stabbing him through it, the killer inspects the knife inquisitively, as if checking to see if he actually got him. While it's still not a terribly plausible scene, the killer's demeanor suggests that he encountered Phil in the restroom by coincidence and improvised the kill, rather than anticipating all of Phil's actions as part of a perfectly executed plan.
The general logistics and planning of the murder are a separate issue - because no, the murder was planned. The entry just says that it's "highly unlikely", putting it mildly, that the killer could guess the exact position Phil would pick to listen to the noise. Just a few inches up or down, left or right, make a huge difference. The killer looks at the knife admiring the results, because if he had any doubts that he got his victim, he'd be trapped in a bathroom with a screaming, wounded, angry Phil and plenty people who could come and help.
To be more clear, the correction here is that Phil had heard strange talking/whispering rather than music, which makes it at least a little more plausible the killer would think he might put his head up against the wall at a certain spot. Unlikely for sure, but unlikely isn't a mistake, it's just what movies do. Phil's death was planned yes, though it stands to reason the plan was more "surveil and strike when vulnerable" and less "wait for him in this particular stall we know he'll be next to."
Revealing mistake: At the start when Phil Stephens is being stabbed, when the killer draws back the knife you can see there is already blood on the knife. Its only there for a second so you have to look carefully. (00:07:45)
Revealing mistake: In the opening scene when Phil gets stabbed in the head, watch carefully and you can see the retractable blade popping back out when he pulls his head away. (00:08:05)
Continuity mistake: When the girl - during the Stab film - touches her boyfriend's jacket and gets blood on her hands - in the second clip there is much more blood on her hands than in the first clip. (00:10:10)
Continuity mistake: In the beginning where Jada Pinkett Smith is stabbed in the back, you see a white girl to her right look down at her arm as Jada's blood lands on her. If you watch the background closely as Jad is dying and stumbling around, the same girl is still looking around, as if it just happened. (00:10:10)
Continuity mistake: During the last stabbing of Maureen Evans, the killer puts his right arm around her and stabs her with his left; but from the back view, his left arm is around her, and he is stabbing her with his right. (00:10:20)
Continuity mistake: When Maureen's boyfriend reveals not to be Maureen's boyfriend at all, the height he holds his knife at changes between shots. (00:10:25)
Continuity mistake: During Maureen's death scene, at one point the killer has an arm around her waist and as they make their way through the crowd of the most unruly moviegoers in history there's a girl in a blue dress that runs past them. Behind her there's a blonde lady that is drinking from a Pepsi paper cup and stands to cheer. In the next shot she's still cheering but from her seat, her cup switching hands too. Subsequent shots from the initial angle feature her again bopping on her feet. (00:10:45)
Continuity mistake: When Sidney wakes up and answers the phone, the position of the watch on the desk, beside the caller ID, changes between shots. (00:11:50)
