Factual error: The scope Jim is using is completely wrong (yes I know he tested the wind using dirt) but as a U.S.M.C. Marksman his scope would have had mil-dots on both the horizontal and vertical bars. (00:04:24)
Factual error: There is a calendar in a scene towards the end of the movie which shows the date as Wednesday April 30, 2021 but the calendar does not align to the days of a real calendar. That date will be a Friday. (01:25:54)
Continuity mistake: In the desert digging, the Nova's trunk is open, then shut. (01:42:00 - 01:45:00)
Factual error: The Channel 5 WNP Newscaster said, "it is now believed he [District Attorney Berdido] and his family were killed..." and running along the bottom of the screen was "4 confirmed dead in Fort Lauderdale gas explosion." This was a LIVE report showing two streams of water onto the house still burning inside. An investigation would barely, if at all, be started at this time and no-one would be "confirmed dead" this early. It would not even be known if anyone was home when the house exploded. (00:04:34 - 00:04:55)
Factual error: Dr. Boxer is told the experimented upon baboon died. He asks that an autopsy be performed. Autopsies are performed on humans. A post-mortem examination on animals is called a necropsy. (01:01:45)
Other mistake: Jane's top includes a scarf that is wrapped around her neck a few times. She starts to remove the scarf by unwrapping it clockwise. When the camera shifts, and she resumes unwrapping the scarf, she goes counterclockwise. (00:20:55)
Other mistake: Packie arrived at Frank's garage on a bicycle, wearing a brown coat, hat, gray hooded sweatshirt, patterned shirt, and a T-shirt. Swaino arrived on a motorcycle, wearing a tight jacket, no hat, black gloves, and black jogging jacket with white trim. When they were outside by the grill, they had large sweaters over their coats. It isn't known where these sweaters came from. It can be assumed the blanket Swaino used at first was from Frank's garage, but the sweaters did not appear to be Frank's. (00:25:32 - 00:37:35)
Continuity mistake: After the police officer starts dragging his wounded partner toward their SUV, the camera shifts to Jake and Henrietta talking along the side of the house. When the camera returns to the police officers, the officer dragging the other officer has not made any progress and even appears to be further back from where he started. (01:21:45)
Other mistake: When the helicopter was flying toward and over Apex Island, the helicopter (as well as the similarly-sized box) was about 1/10 or 1/12 the width of the island. In the next view, from almost ground-level, the helicopter was about as wide as one pine tree. (00:10:30)
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)
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)
Factual error: Dylan (Scott Eastwood) was in a jail cell yet had a bottle of prescription pills in his pocket. The pills would have been confiscated before he was put in the cell and administered to him on schedule by staff/nurse. (00:28:10)
Visible crew/equipment: When the group realise they have triggered the alarm system, one of them says "Shhh listen" and the boom microphone appears briefly above his head. (00:45:26)
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)
Other mistake: William Tillich (AKA Bill Tell) had one suitcase which could not possibly hold enough sheets (or thin blankets) to cover/wrap all the furniture in his motel room like he did. (His suitcase was not very large and also contained his clothes.) He covered an even larger area of furniture in Gordo's house. It isn't clear if he used his own sheets or just happened to find the same kind in Gordo's house.
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: Before Jen gets on the yacht, Aileen's green halter strap can be seen because the left side of her hair is on or over her shoulder. When Jen gets on board, Aileen's hair is in front, covering up the green strap. The camera shifts when Lewis is hugging Jen and Aileen's green strap is visible again with the left side of her hair behind her. There is no noticeable wind and Eileen is standing in the same place. (00:32:10)
Continuity mistake: When Sami was having car problems, her bangs were mostly messy and longer, but suddenly neatly combed straight down a few times, such as after she slammed the hood shut, saw a shadow, and quickly turned around. (00:30:10)
Continuity mistake: The CGI billboard on the lawn moves to the left between shots.
Factual error: Teenagers Claire and Fiona would have been carded and not permitted to enter the "Saints and Sinners" bar because they were under age 21, but they were able to sit at a table and get served alcohol. (00:51:37)