Continuity mistake: At the beginning of the scene with the two girls on lunchlady duty, Griffin's friend Mike is juggling a football, followed by another friend with the same black letterman jacket. However, after the cut we find in that spot Griffin himself, in red, instead. One could say that maybe the ball juggler is not Mike but another guy with a crew cut, he's not wearing a bag, after all. Which brings to the subject of the other continuity mistake there; when Velma replies "You're only on top of the Bloom bracket because...", Mike is not wearing the bag that he was wearing in the other views. (00:38:25)
Other mistake: The second time we see the 'French toast' scene, Daphne says the line on top of the stairs in a different way from the first. She is simply standing with both feet on the penultimate step, while the first time around she began saying the line when one of her feet was still in motion. It also takes her twice as long, no cuts, to get to the bottom of the stairs. (00:04:30 - 00:16:30)
Continuity mistake: In the school hall, Daphne and Velma find Griffin zombiefied. In the shots with the widest camera angle (same as when the two buddies to discount Draco Malfoy arrive playing ball) Velma is wearing her cloud badge on her chest, above the overalls. It's on the overalls in the rest of the scene. (00:45:30)
Factual error: Daphne gets a bit of water spilled on her from a glass at lunch, and she stays with the wet patch (which is just water, as stated) throughout the whole day, arriving at home when it's dark with the same wet spot visible. With all the toweling she did, and even simply by body temperature, the little dampness should have been dry by the end of the afternoon. (00:21:50 - 00:31:40)
Continuity mistake: When Carola shows Daphne the Bloom Bracket waving her arm at it, there's a sudden cut in the middle of the gesture, and suddenly people in the corridor have changed position. Moreover, right before the camera cuts away one more time, a black person is walking on the left of the frame, and he is walking again behind Daphne a few seconds later (when she is staring at the board after the word "extracurriculars" is spoken). (00:08:40)
Other mistake: Nothing about Nedley Blake's interference in his daughter's morning routine at home makes remotely sense the way it is shown. It takes him 18 seconds (with cuts) to do something that needed to be made in the 6 seconds it originally takes Daphne to come down the stairs, and the first time around he was also shown arriving from the kitchen, which would further expand the time needed (considering also that the second time he apparently dropped the tray, causing rattling noise that Daphne should have heard). Not only that; the playlist action (which is something her computer science mother could have easily done with actual software, especially given the level of tech available to every teen in the movie) takes twice as long too, and at the end of it he exits the frame from the wrong direction - he should have headed left, because he needed to get into the closet to pass Daphne the proper clothing posing as the automated wardrobe.
Continuity mistake: At the end of the first day at Ridge Valley High, the light flickers when Daphne is in the front of her locker. She closes it to investigate. The action spans across two separate shots, but she has her hand at different height. The first time her hand is on the lock, the second time much lower. (00:12:30)
Continuity mistake: Velma reluctantly agrees to Daphne's idea to check out of the mysterious locker. She says "We'll come up with something." Right part of the frame, and in the background there's an extra (black kid with a plaid white shirt) that is simultaneously also eating at the table in the reverse shot. (00:31:15)
Revealing mistake: Velma just learned that Daphne is going to attend her same school, and does not look thrilled. Spooky music starts, with a zoom on some elements of Velma's nerdy room. And one of the things she must be a huge fan of is our good friend the Lorem Ipsum, since behind the post-it sticker notes ("Why?" "THEY are watching") you can tell the papers pinned to the wall are just that; filler text gibberish. You can read literally "Lorem ipsum" under the headline of the "Internship at Bloom" clipping. (00:03:50)
Continuity mistake: Daphne is looking at the bun with suspicious looking meaty mush; in the close-up the milk carton is almost perfectly aligned with the tray, while it's at an angle when she gets bumped into by the random guy (something even her dad could never prevent from happening, incidentally). (00:21:40)
Continuity mistake: Daphne finds her mom sitting down and strapped to some device. She puts her bag down and reaches for the tubes, with both hands. Tobias tells her to stop and there's a cut to Velma and her, with Daphne using just one hand, the right. Next shot and she is still using both hands. (01:02:45)
Continuity mistake: When Daphne says "Wow, sounds pretty intense" as a comment on the "GPA on steroids", her hair is in front of her shoulders; Mikayla responds, and Daphne's hair is gone from the right shoulder. Moreover, Spencer is holding his strap with his left hand, and he wasn't before. (00:08:55)
Continuity mistake: In front of the locker she broke into with Daphne, Velma holds Olivia's blue ribbon in her left hand. She turns towards the locker and is surprised by Two-Mop Maggie. She is not holding the ribbon in her hand anymore, and her right hand is covered by an oven mitt. (00:37:15)
Continuity mistake: In the first part of the denoument, with the two girls confronting Bloom, Velma says "Of course. Olivia was a musical prodigy." Her right hand is inside the backpack, which she is holding by the top using her left hand. Cut, and her right arm is across the bag. (01:03:40)
Continuity mistake: Daphne is talking with mom and dad after the second day of school. At least two takes of the scene have been filmed, because the ice pack on Mr. Blake's knee is tilted in two different ways on his knee, and they keep being mixed together in the final edit. (00:31:40)
Continuity mistake: It's no wonder that the two protagonists were caught red handed in front of the locker when they broke into it the first time; it was 10 past noon when they began, it's 20 past when they are done (of course it can't be this long, it's a continuity error). (00:36:15 - 00:37:20)
Continuity mistake: Sabotaging "Violet Johnson", Velma and Daphne are peeking from the door of the lab; the reverse shots with the hand in foreground don't match the rest - the hand looks to be operating the equipment but it is not when the table with the teacher is shown. (00:48:50)
Other mistake: Velma tries to "override the system" to free Mikayla; the screen fills with the typical pseudo-hacker gibberish from the Hackertyper app, and she asks Daphne to tell her the serial number; Daphne reads just the first part of it and leaves out the rest.
Continuity mistake: As they get motivated to go look for the bad guy at the end, Velma tells Daphne "I am stronger than I ever thought I was", with the strap of her bag passing inside the collar, and not outside and by the top button like in the rest of the scene. (00:58:00)
