Continuity mistake: Velma gets in the back of Mikayla's art installation looking for the power cables, and Daphne follows at distance. In the close-up, the shadow on the back of the projection screen is closer to the edge than in the preceding aerial angle. (00:49:40)
Factual error: The gazette clipping at the beginning of the movie where Velma wrote her disdain for Carol is dated Thursday, March 25. Neither year when the story could be taking place based on other hints had March 25 happen on a Thursday. (00:03:50)
Revealing mistake: As the girls handle the drone, and even more obviously when it drops on the security guard's head, it is clear by the way it bounce and clatters that it is almost weightless and certainly couldn't knock someone out cold. (00:59:50)
Continuity mistake: When Velma slams the big pile of work on the chemistry teacher's desk, the paper on top of it is a couple inches off the side closest to the professor, but it's perfectly aligned with that side after the cut. (00:48:15)
Continuity mistake: The time counter during the call to Daphne's mom from the secret school room jumps from 5 seconds to 13, 31 to 44, 57 and 1 minute and 18, with no possibilities for time to pass during each line/cut. (00:56:40)
Continuity mistake: When Velma presents a new mop to Two-Mop Maggie turning her back into Three-Mop Maggie, the ribbon in close-up has the two longer bits across the handle, which becomes just one in the other shots. (01:10:15)
Continuity mistake: Outside Bloom, Daphne says she can hear her dad "loud and clear." The zipper of her jacket in the next shot is closed more. (00:59:00)
Continuity mistake: Once Mikayla is getting 'eaten' by the tube, Daphne holds Velma's arm clinging to her sleeve; at the cut, her hand is relaxed instead. (00:53:25)
Continuity mistake: Velma is holding the scooter the 'ghost' was using; her hands are placed in different positions between shots. (00:55:30)
Continuity mistake: When the kid says "Do you wanna go out sometime?" to Lunch Lady Velma, a girl with brown hair, nerdy glasses and a shirt with rainbow stripes walks by behind him. A couple of shots later, there she is again, walking along the same path again. (00:39:40)
Continuity mistake: Just before introducing Tobias Bloom, the principal has blue earbuds in her hands. She is holding them as she begins to gesture towards the stage entrance, but they have vanished with pure sleight of hand (or rather, editing) in the following shot. (00:33:10)
Continuity mistake: In the principal's office after melting the locker, Daphne and Velma are being scolded. Miss Piper's glasses rest on the desk in a different way depending on the angle (in the frontal shots the right side is more elevated). (00:37:45)
Continuity mistake: Time to sit up from the Conflict Couch; Daphne in the close-up lying down has all her hair off the shoulders, but coming up she starts off with a lock of hair along her neck and in front of the right part of her body. (00:27:35)
Continuity mistake: When the girls melt the locker for the second time, the circuit is undoubtedly positioned under the lock, but as the principal walks behind them saying "What!", you can see it poke from the side of the open door. (00:44:00)
Continuity mistake: When Carol demonstrates the various texturing options, different takes of the same angle have been used, since Daphne holds the changeable T-shirt with her finger sticking into the neck or not between cuts. (00:21:05)
Continuity mistake: Once Daphne gets splashed with water on her shoulder at the cafeteria, she shows up at the laboratory with her shirt more wet than earlier. The water stain is even bigger by the time she sits with Velma. (00:21:45 - 00:31:40)
Revealing mistake: When Velma sabotages the science project making it explode into purple goo, you can see that the vial of chemicals she tampered with simply spray around clean liquid, and the purple goo falls from above. (00:23:55)
Continuity mistake: Griffin is introduced as a suspect, and is shown high fiving the other guys from his cohort. In the part that follows, the paper bowl on the cafeteria counter keeps switching left and right of the opening. (00:39:25)
Continuity mistake: Once Velma has checked out Spencer's lunch antics on her green portable device, between shots it keeps switching from having the screen part sticking out or being tucked in with the rest. (00:31:00)
Continuity mistake: In the cafeteria, Carol is telling the two protagonists about Griffin Griffiths and his brothers and sisters. The hair of Mikayla next to her jumps in front of her shoulder between shots. (00:30:15)
