Revealing mistake: After Charlie talks to Emma in Francine's old bedroom and is standing in the doorway, the background (segment of the hallway) is obviously fake. Shown are less than five of the top steps on the staircase, only a fraction of the size of real steps. The lower section of the banister is also a reduced size. (01:31:35)
Other mistake: The issued sidearm for the Spanish National Police is the H&K USP 9mm Compact, which has a capacity of 13+1 bullets, and the Civil Guards' is the Beretta 92fs/M9, which is a 9mm and has a magazine capacity of 15+1 bullets. As of 2020 the Beretta is being phased out for the H&K USP C. The police officer fires a total of 5 bullets from his Beretta then the slide locks back because its dry. He has no magazines for reloads either. I highly doubt the Spanish police issues 5 bullets to their officers. (00:33:00 - 00:35:30)
Continuity mistake: Toward the end of the film Ruby says goodbye to her family and gets in the car to head to college. The car pulls away from her home and drives for about 5 seconds when Ruby yells "stop the car". She exits the car which is positioned nearly exactly where it was when they started on the families' property.
Continuity mistake: At the restaurant, the background varies a few times behind Beth and Jack seated at a table. When the background is blurred, a young man can be seen to the left behind Beth, but he is not there when the background is clear. (Despite the different camera angle, he should still be visible.) Instead, two men are seated at the bar counter or an elevated table and a woman behind them is facing the screen. (00:11:47 - 00:12:49)
Continuity mistake: After talking with Bullock on the roof, Batman is in his vehicle and talking to Hugo. On the screen, Hugo lifts up a glass to his mouth to take a drink, but when the camera cuts to a close up of the screen, suddenly his arm is lower, and he is once again lifting the glass to his face. (00:05:37)
Continuity mistake: Toward the end of the film, Hannah, who has had her face pummelled by one of the villains emerges from the creek having escaped the fire with only minor bruising on her face and a cut on the bridge of her nose. Immediately after that, they are rescued but her face is now deeply cut, both eyes are blackened and there is a deep gash on her cheek.
Other mistake: James supposedly did not give his name when he filed a complaint against Dr. Clark, which would make conducting an investigation to determine if the complaint was valid very difficult. Dr. Clark would be entitled to due process (presumption of innocence) and it is highly unlikely that the Medical Commission would have taken such quick and drastic measures against Dr. Clark under the circumstances.
Continuity mistake: In the initial view of Billy in the tree ("saved for later" by the leopard sleeping on another branch), his head is hanging face up alongside a tree branch as wide as his head. When the camera zooms in showing the middle of Billy's face, the left side of the screen should be all brown, representing the branch. Instead, there is blue sky down to his eye and blurred tan/brown representing the branch. The brown might supposed to be the dried grass, but Billy has not moved his head. (00:51:25)
Factual error: The initial police scene takes pace 20 years ago. The present year is 2021, so 20 years prior would've made it 2001. The police Chevrolet Tahoe at the opening scene of the film was only made from 2007 and up. (00:05:40)