Factual error: The deer in the forest somehow does not hear the giant dinosaur approaching, so doesn't run away. (01:21:10)
Suggested correction: A different interpretation is that the deer knows the difference in the sounds - gurgling/roars of an approaching herbivore versus carnivore - so it didn't perceive it as a threat until it got unusually close (so the deer looked to see why). The dinosaur flung the deer aside, then proceeded to eat the vegetation where the deer was. It isn't likely that the dinosaur (if a carnivore) would toss aside a fresh deer meat brunch in favor of some green brush.
The therizinosaurs were herbivores.
Other mistake: When Tsireya is shown swimming with Aonung and Rotxo, her right shoulder strap is glitching through her shoulder. It then proceeds to slip back out of her shoulder and into its correct place. (00:59:10)
Factual error: The teacher sends her pupils to the woods to collect chestnuts. Later we learn that the date when all this happened is May 30th. Chestnuts ripen in autumn, around September-October. (00:52:18 - 01:05:06)
Continuity mistake: Alan goes into his appointment with Dr. Fredericks at 5:08, and it is still 5:08 on the wall clock when he leaves her office. (00:10:20 - 00:14:03)
Character mistake: We see the lead driving on the motorway to get to the cottage. She leaves at junction 6 for Princes Risborough. Which means she is on the M40 that goes to Birmingham. When she arrives the host asks about the drive down and mentions the M4. This is a different road entirely, that goes to Swansea.
Other mistake: When everything is moving in slow motion, to indicate how fast Black Adam is supposed to be moving, one of the mercenaries throws a grenade from a distance that is shown moving faster than the lightning moving through the bodies. It reaches Adam before the truck he just ripped apart starts to fall.
Suggested correction: The grenade isn't moving faster. Black Adam is moving towards it, he closes the distance. You see it only turns twice before he grabs it and gets to ground level, shove it in the guy's mouth, and then he's back in mid-air in the next shot.
Watch the scene again. Black Adam isn't even in the shot when the grenade is moving faster than everything else. The grenade is moving away from the guy that threw it. He's even moving as fast as the lightning.
Other mistake: At the end the camera bulbs would not work as they are electric. This is proven when the music starts after the creature leaves the area. (02:01:00)
Continuity mistake: The top of Brecken's head was close to (within a few inches of) the headboard before his mother brought the pillow. When his mother put the pillow over his face and the camera shifted to a right-side rear view, the upper part of the bed was raised about 45°. When Lang Dotrice (Brecken's father) arrived and sat on his bed, the pillow used to smother Brecken was at least a foot away from the headboard and Brecken's head (still under the pillow) was about a yard away from the headboard. (00:04:05 - 00:07:16)
Other mistake: Si was kneeling on the floor, stabbing his upper left arm and blood was gushing out. After he moved his right arm with the bloody knife to his right side, the aerial view did not show any blood on the floor, across his thighs/pants, or even dripping down his left arm. (00:27:50)
Deliberate mistake: After Sam freed Gary from being tied up by the aliens, Gary pulled off the cast he got earlier that day and was able to use his left arm as though it had never been broken. (00:45:43)