Continuity mistake: When Malik poured a larger amount of syrup on Bobby's pancakes, the original smaller amount was not there. (00:30:48)
Other mistake: When Zoe Levenson first looks out the window from the spaceship, the earth is from the bottom moving towards the top, this is opposite to the ship spinning direction, which can be determined by the direction of the gravity. (00:12:50)
Other mistake: Liam Neeson jumps into ice water to rescue his brother. He then painfully pulls his brother into the cab of the truck. Inside, he revives his brother after which they have a lengthy conversation. Liam's Mike McCann never starts the truck engine or turns the heater up, even though he and his brother are soaked to the skin and the brother is coughing up ice water from his lungs. In the next scene, both appear dry, in the same clothing, with no signs of hypothermia.
Other mistake: The same 2 family photographs decorate the family home over and over and over again. Sometimes one or two of the members has been Photoshopped out.
Plot hole: Diabolik blinks in Morse code to his accomplice the location of one of his hidden stashes. He says it's in 'the third brick to the left' and the street name, but no address or other reference. She (who previously knew nothing about the location) finds it immediately. It's worth noting that the movie is a faithful adaptation of a couple issues of the comic, but this bit of subplot is a fresh addition and the original hiding spot in the 1963 issue was a plausible one (cave behind a specific waterfall).
Continuity mistake: Joe has 'Rick C' (his partner) listed as a contact in his phone - late on in the movie when Joe calls him from the bathroom stall, he is listed as just "Rick"
Character mistake: Immediately after kissing (through masks) and having close contact with JJ, Valeria removed her protective mask and went to check on her sick/crying child. Valeria was clicking her tongue, kissing her child on the face/head and putting her hands around the child's ears/hair. Valeria did not take appropriate preventive measures for contracting and/or spreading COVID-19. (00:18:40 - 00:19:29)
Factual error: There was a lot of thunder and lightning before the lightning strike that set the barn on fire, but there was no obvious loud thunder AFTER the strike. Lightning can be seen BEFORE the sound of thunder (because lightning travels faster than sound). (00:03:25)
Other mistake: Grace Lewis shot a man in the head when he was standing less than three feet from her, but Grace did not get any blood splatter on her face or elsewhere. Neither did George Clements, who was standing near both of them. (01:15:03)
Continuity mistake: Before opening the door, the "M" on Eric's letter jacket is on his right lapel but on the left when he enters the room, as well as when he exits. (This is separate from the "M" being on his right lapel but on the left when facing the mirror). (00:40:09)
Continuity mistake: The door had multiple small rectangular glass panes enclosed in wood frames, but the glass pane that Alan Schaefer's head/body went through was larger and no wood frames were visible. (00:40:28)
Continuity mistake: Mia holds her doll's face next to hers, but the doll is not there when the camera shifts. The doll is to Mia's side on the bed, but instantly back next to her face. (This is independent of the times Mia moves her doll.) (00:02:25)
Factual error: When Sharyn woke up after surgery, she did not know how long she had been there, but her abdominal scar was practically healed. Under these circumstances, she should have had a urinary catheter but did not. Also, when Sharyn lifted her gown to look at the scar, she was wearing bikini-like lace-trimmed navy blue underwear - it is unlikely anyone would have put such underwear on her after surgery. (00:05:14)
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)
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: The white gift box was placed on the car's hood near the passenger side front wheel indentation. When the female cop (Valerie) turned around, the box was at an angle, not parallel, to the indentation. (00:02:21)
Revealing mistake: DEA Agent Rick Bowden was already seated "in the best position" before knowing where Ross would sit in the SF library. Chris Tarbell already had a surveillance camera behind the seat Ross chose, giving him a clear view of Ross, also before knowing where Ross was going to sit. Even if there were cameras in other positions, the DEA Agent and Chris Tarbell being at the right spots in advance was too coincidental to be by chance alone. (00:02:09 - 00:02:30)
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)
Revealing mistake: During one of the chase scenes, an SUV hits a rock barrier and flips over landing on its top. The car spins around, and we see that it is empty. The driver then climbs out as if he was just in the vehicle.
Continuity mistake: When two officers go to inform Ronald Whitlock (Bruce Willis) about his sons, Ronald shoots his pistol at the Black officer and hits him near his inner right eyebrow. (A large black spot can be seen between his eyebrows.) When the camera shows the dead officer, the black mark is gone and the bullet hole is on his forehead centered about 2" above his left eye. (00:06:40)