Other mistake: In the frame you can see the girl is playing on a newer Macbook, she is using a wired headset but the headset is not plugged into the laptop, you can also see she is using a wired gaming mouse, and the USB cable is just sitting there not connected to anything. The Macbook is USB-C only and the mouse is USB-A.
Other mistake: The way Katelyn exploded was described by Mara as being like a balloon popping. Every time a student exploded, blobs of blood (and tiny pieces of the body) splattered everywhere, making a huge bloody mess. When more than one student exploded going down the stairs, blood looked like it was being poured from a bucket. Sometimes, parts of clothing could be saturated in blood (such as a sleeve), but there was always more blood splattered nearby. When Katelyn was at the doctor's office (to get a piece of someone's bone removed from her forehead), "blood" goes smoothly/evenly around her eye to the lashes with no gaps or splatter marks. Blood from an explosion would not fall this "perfectly" around eyes. For example, folds in the eyelids would block some blood from landing in certain places and eyelashes should have some blood on them but Mara's did not. (01:41:27)
Other mistake: If Grace had Billy at age fifteen (without his father in the picture), has worked as a receptionist in a law firm, and undoubtedly had been missing a lot of work due to her failing liver, her house and furnishings would be well beyond her means.
Other mistake: In the opening scene where Joey is breaking into Ms. Dillard's house, he quickly smashed a window with his flashlight and immediately crawled through the window - without checking to see if shattered glass fragments were still in or around the frame. Despite his carelessness, he did not even get a cut on his hands or elsewhere, which would be almost impossible under the circumstances.
Other mistake: After Jim shot the doe and found it lying in the snow, there were no visible deer tracks or dripping blood trail leading to the doe. (00:01:25 - 00:02:05)
Other mistake: A crow crashed into a bedroom window, causing a small hole in it with radiating cracks. There was blood splattered around the hole as well as two long downward/ vertical lines of blood. Although it is possible for a bird to crack a window, it is much more likely that a bird breaks its neck without causing damage to the window. In the event that this crow did put a small hole in the glass, at least some fragments of feathers should have been stuck around the hole, but there were not any. (00:06:55)
Other mistake: Based on where Carol is standing near the top of the stairs of her new apartment, more of the couch behind her should be to the left of the screen (like it is in a later shot). (00:48:10)
Other mistake: Bo walks through the charred corn field, but her shoes do not get sooty. When she finds Eden's flower ring, the flower petals are intact, but should be burned beyond recognition. (01:25:18 - 01:25:39)
Other mistake: The time freeze dome extends well beyond the little Italian square and covers the surrounding buildings as well. Everybody and everything is paralyzed/suspended, but a gramophone in a window looking directly at the square continues to play. (00:34:03)
Other mistake: The woman was impaled by two stakes, one through her chest and one through her right shin. The man pulled her out of the hole from the edge at an angle to her left side. From this position, he could not have initially kept her body parallel to the ground or subsequently pulled her up at an angle without causing additional injuries or death. (00:14:33 - 00:14:55)
Other mistake: On 22's name-tag wall some of the names repeat themselves. Yossi Mizrahi and Itay Cochabi can be spotted twice, once towards the center and once towards the right side of the screen. There might be more.
Other mistake: The opening credits show a bit of Ava's rather extravagant biography. She is involved in a DUI accident that kills two people; the news article says that it happened "early Thursday morning." What follows is a police photo labeled 06/27/95, a Saturday. Then we see the police report; not only the incident time is 10:30 PM, but the date is March 15 1999, which was a Monday. It is not separated incidents, since the police photo is then shown again, next to the "Thursday" article (and the fact described in the article is life-changing). (00:08:10)
Other mistake: In the scene with a leak in the kitchen, the woman fixes it by turning an isolating tap above the leak. However the water would have been travelling up the pipe to the kitchen tap and so that wouldn't have stopped the leak. (00:34:00)
Other mistake: The weapon which the gunman is holding is a WWII era Nazi MP38/40 submachine gun. The weapon from the magazine housing to the end of the barrel (muzzle) is completely bent down about 25-30°. There's no way the weapon would shoot as straight as it was shooting earlier if at all. I highly doubt the firing pin/bolt can even make contact with the primer of the bullet in the magazine. The weapon looks cartoonish if anything. (00:48:30 - 00:50:00)
Other mistake: In the montage showing Mike and Marcus' parallel (but also wildly divergent) lives, Marcus asks Alexa to turn down the volume. However, the video he is watching pauses instead. In the next shot, it is paused again, but on a different frame. And before the fan goes haywire and hits the screen, the screen is already turned off (but the breaker hadn't tripped yet). (00:32:00)
Other mistake: Jude would not be able to write that neatly - especially that fast - while holding a floppy notebook in the air. The right half of the notebook was sagging while he wrote three perfectly lined rows ("I told you not to make him mad."). (00:46:03)
Other mistake: Isaac was able to break through his wrist restraints (taped to arms of a chair), escape two androids, quickly find and escape with Sara (while other androids started pursuing) - during a "full security lockdown" in a facility previously unknown to him. Isaac would not know the building's layout or where doors - and an exit - would be, but he had little problem getting out during lockdown while numerous people and androids were chasing him.
Other mistake: When the kid first leaves and enters the house, he takes out the crossbow with an arrow in it but the elastic drawstring is flapping around in front. (00:22:33)
Other mistake: At the docks, when Min-jung is inside the truck that is surrounded by zombies, there is a moment shown from inside the truck where the helicopter is shown in the background. The helicopter is far off in the distance, but when Min-jung begins to put the machine gun under her chin to shoot herself with, Jung-seok and Min-jung's daughters (who are standing right next to the helicopter) can see exactly what Min-jung is doing inside the truck, even though it should be too far away for her to see what is going on. (01:45:13 - 01:45:39)
Other mistake: At the beginning, Jack reveals that he has lots of food allergies and asks the bartender to prepare his shake lactose free, implying that he is allergic to dairy. But later he eats a snowman cookie that Mrs. Claus reveals has butter in it.
Suggested correction: Being lactose intolerant does not mean you're allergic to dairy. It means you lack the enzyme (lactase) needed to break down lactose and usually results in gas or an upset stomach. However, butter is high in fat and low in lactose, so a lot of lactose intolerant people can eat butter or food containing butter just fine.