Continuity mistake: The main character is exercising in the gym and in the background is a man on the abs machine holding the handles above the grips. In the next shot he is holding the grips, and then next shot back to above the grips. (00:38:00)
Factual error: The opening scene shows Cassie and Bryan booking their holiday on a laptop. The dates that they book the holiday home are between May 5th 2018 and May 12th 2018, which means the movie is set in 2018. But later in the movie, when Cassie finds the video of Bryan with the two women on his phone, the date is listed as "Sunday, May 7", and May 7th 2018 was a Monday, not a Sunday. (00:01:05 - 01:10:55)
Continuity mistake: When young Tiffany is eating ice cream at a restaurant, the amount of ice cream left in the clear glass bowl increases after she eats more. The ice cream in the bowl starts out being about half-full, goes down to less than one-fourth, and returns to about half-full again. (01:02:47 - 01:03:19)
Continuity mistake: When Elisabeth is saying goodbye to the family, she hugs Ehrenfried and steps away from him. In the next shot, he is still holding her slightly before letting go a second time. (00:17:15)
Other mistake: While "dead" Mike is bent over his car's engine, his left leg moves. (00:32:40)
Continuity mistake: The mayor suffers a bleeding head wound while evacuating City Hall. Several scenes later he is shown with no wound at all. Not even his hair is mussed. (00:40:30 - 00:46:30)
Continuity mistake: When Jason lunges at Batman with his knife, there is a pile of garbage by the wall where he lands. In the first shot the barrel by the garbage is wooden. But in the next shot it's suddenly a metal barrel/drum. It then changes back to a wooden barrel again. (00:04:20)
Continuity mistake: The middle curtain on the passenger side of the RV is pulled open to different extents (toward the sides) when Drake is snooping around. Depending on the camera's view, maybe a foot of the curtain can be seen to the right. The other views show much more of the curtain, indicating it is not pulled to the side as far (and might possibly be closed). When a larger amount of the curtain is showing, there is also a small section of a pleat partially on the sill. (00:04:00 - 00:04:27)
Continuity mistake: After a camera shift while talking to Mr. C, Chris' jersey was pulled down more over his pants (lap), but his hands were pre-occupied playing with the string on his hooded sweatshirt. (00:06:35 - 00:06:58)
Continuity mistake: When Mrs. Marsh is setting Jonathan's plate in front of him, the mashed potatoes are to Jonathan's right, but when the plate is set on the table, a close-up shows the mashed potatoes are to Jonathan's left. Afterwards, the mashed potatoes are to Jonathan's right again. (00:35:55)
Other mistake: A female bull shark has between 1-13 pups. The exact number in the movie is questionable (due to their speed), but appeared to be well over the maximum 13 and perhaps closer to double this amount. Classified as "other" instead of "factual" mistake because the mother shark's DNA was altered, which could possibly explain a higher number of pups per pregnancy. (01:03:20 - 01:06:40)
Revealing mistake: After Jess leaned her bicycle against the pole, it slid down onto the ground. In subsequent views of the bicycle to Jess' side, the bicycle appeared to be upright and not what would be expected if it was lying on the ground. The height of the bicycle's seat should have been closer to the chair's arm, not Jess' shoulder. At a different angle before Jess got up, the bicycle was positioned like it was right after it slid onto the ground. (01:04:02 - 01:05:47)
Continuity mistake: The clothes Tyler and Kassi were wearing at Kassi's house were not the same when Kassi came to dinner that day at the Burnside's house. It seems unlikely that BOTH would change clothes before dinner. (00:31:49 - 00:32:40)
Suggested correction: Apparently they did. It was probably Tyler's idea, presenting Kassi in the best possible light to assuage suspicion and maintain his image as a good Christian Boy Scout.
Continuity mistake: When Stallone kills the bad guys with skull masks in the corridor of the bar, his motions pointing the pistol don't match the positions of the lemming-like goons he hits. For instance he has the gun all the way to his right for the first one he kills, but the guy is shown with a hole opening in his forehead while he's in the middle of the corridor. (00:29:00)
Deliberate mistake: The movie is set in "Harburg County", Pennsylvania, but there is no county in Pennsylvania called "Harburg." (00:13:38)
Character mistake: Immediately after the crash, when Reeves is carrying his youngest child Sophie, the actress opens up her mouth, even though she has already drowned. (00:14:43)
Continuity mistake: When Priest and Georgina throw the molotov cocktails at Juju from the balcony, watch closely - right as Priest throws the second molotov cocktail and the camera cuts from a bird's eye to a ground-level angle, the position of the two men and the carpet they're standing on changes between cuts.
Revealing mistake: Davey at the beginning of the movie is looking at the newspaper he's delivering to Mr. Wayne Mackey. Just from a glance at the page you can tell that something is off, since the article supposedly about a missing boy appears to be written entirely in first person. Upon closer inspection, turns out that it's filler text from chapter IV of Robert Louis Stevenson' s "Treasure Island". (00:01:30)
Factual error: When the saturation divers open the outer hatch on Kursk, they drop a glow stick. When they do, it falls to the floor on the submarine, indicating the inner hatch was open. The inner hatch of Kursk was closed, later opened by an ROV.
Other mistake: The Israeli commandos are painting an orange Mercedes black using brushes. In later scenes the car has perfect factory finished black paintwork.