Continuity mistake: As Keda is tumbling down the face of the cliff, he smacks against a small ledge on his way down before hitting a second ledge and then landing on a third. But as the camera goes down the face of the cliff from the top of it, the two ledges he hit on the way down are gone, showing a mostly flat face. (00:28:20)
Continuity mistake: At the school, when Scott's suit is malfunctioning and he's big in the janitor's closet, his head is tilted towards his right shoulder. When Hope is working on the suit, we see Scott's head is now tilted towards his left shoulder, even though he's stuck and wouldn't have been able to move around like that. But in the next shot it's back to his right.
Continuity mistake: Meg starts the trip wearing a red flannel shirt over a blue cardigan over a gray T-shirt. Along the way she first drops the flannel shirt, then the cardigan (the color of which seemed to have gained saturation). She's not seen carrying them or any bag that might have held them. When she finally faces It, all the clothes are back on. Calvin's case is even more evident: he starts with a jacket over a red shirt, ends up with a just a now-gray T-shirt (matching Meg's) but is back with jacket and red shirt at the end.
Continuity mistake: As Lara is headed up to the boat's pilot house, she obviously leaves the hatch open, but a far away shot shows the door closed again, as she's climbing the ladder. When she goes back down, it's suddenly open again. You could claim it's the rocking of the boat, but as she's grabbing her gear, the door stays open.
Continuity mistake: After Gillick saves Isabel and they get into the car, the seats in the car don't have any head rests. But after they turn, and the camera shows them in the car again, the headrests are there. (01:02:55)
Continuity mistake: When McCall is about to have the fight in the hotel room, the man who answers the door goes and locks the door right before the fight begins. When McCall is done with the fight, he turns the doorknob and walks out without ever unlocking the door.
Continuity mistake: In the beginning of the movie when Debbie visits Danny's grave, the headstone first reads 1963 - 2018. A moment later when shown from the side, the writing has changed to 1958 - 2017. At the end of the movie when Debbie visits the grave again, it reads 1963 - 2018.
Continuity mistake: When she is in the boat she takes off her blindfold entirely, but after some talking the blindfold is around her neck all of a sudden.
Continuity mistake: At the end of the taxi chase where the final biker is hit by the bus, the bus is shown moving at speed, and easily clears the junction where the taxi halted before you heard tyre squeals to signify it stopping. Yet in the next scene as the crowd gather around the presumably dead biker, the scene is shown happening in the middle of the junction, with the bus stopped almost before it's even entered the junction.
Continuity mistake: During the fight at Aunt May's house, May knocks Tombstone out of the house with a bat. The subsequent shots have him back in the house.
Continuity mistake: After Elizabeth drives her motorbike off the peer, across the frozen lake and stops while she looks back at the police, the Ducati suddenly has different tires than earlier in the escape sequence. (00:25:55 - 00:27:05)
Continuity mistake: At the beginning of the movie, the teacher asks "Has Nicky's mom volunteered?" The guy answers "Emily?" with his arms down his hips, but he had his arms folded across the chest just in the previous shot. (00:03:50)
Continuity mistake: When Daisy walks away from Max on the roof in Vegas, the food and the napkin disappear. In the next shot, they reappear.
Continuity mistake: Peter dives through the window of the attic, shattering it with shards of glass and window frame busting out and falling with him. When the camera pans down to him lying on the ground, there isn't a single shard of glass or piece of frame seen anywhere. (01:56:10)
Continuity mistake: When she is painting the wall and stops to go and hug him, in different shots during the hug the amount of white she has painted lessens, and has a different pattern. (00:07:45)
Continuity mistake: The blue paint blob on the painting changes between shots. (00:47:00)
Continuity mistake: When Jake is serving the cream he uses his left hand, then right, then left again between shots.
Continuity mistake: Anna and Rebecca are sitting on a bench in the golf field holding glasses of wine when Jerry and three of the others ride by in a high speed golf cart chase. Anna stands up to shout at them and slings her glass, spilling most of her wine out. She then turns back around and the camera cuts, and now her glass is back to half full. (00:51:40)
Continuity mistake: When Newt is straddling Thomas with a knife pointed down at his upper left chest, it's very obvious that the knife goes into his chest, through Thomas' shirt. A few minutes later, when Thomas is kneeling over Newt, after Newt stabs himself in the chest, the stab hole in Thomas' shirt is no longer there and he isn't bleeding. (01:50:45)