Revealing mistake: The "bridge" within the crime scene tape is obviously a prop. It should be a continuation of the road, but it is tilted to the left and is more vertical (around 45°). The bridge isn't even very high. When Byron and others go under the bridge to look at the dead girl, there is only a few feet above their heads (clearance under the bridge). (00:04:54)
Continuity mistake: When Lydia is in Emily's office, and she walks in, the door closes behind her. Shot changes, and the door is open, and it's closing again.
Revealing mistake: When Julie is running around the city whilst all the extras are stood frozen, there is a moment where she is walking next to a small park, before beginning to turn right and run down a road. Once she runs onto the sidewalk after running down the road, two girls can be seen stood on the same sidewalk holding hands. The girl on the right can be seen moving her right hand ever so briefly, even though the extras are all supposed to be standing completely still. (00:54:35)
Continuity mistake: The angle of the laptop on the kitchen table changed (and no-one was close enough to have moved it). The laptop was initially more evenly aligned with the edge of the (round) table. A little later, the laptop was not visible, but probably should have been. (00:04:09 - 00:04:44)
Plot hole: Alberto didn't sign up for the Portorosso Cup, and he enters anyway. This should've gotten Luca disqualified.
Revealing mistake: The way in which the flame from the fallen candle started burning the wall painting of the family, as well as how the fire spread (rather, didn't spread) and looked, reveal the fire was computer-generated, not real. (00:24:23)
Deliberate mistake: The view looking out the windshield showed the man on the bicycle had stopped when he was in front of the car's passenger side, but the outside view showed the man still coming to a stop and then tilting his bicycle. (00:07:12)
Other mistake: Blood gushed out of the bound man's lower inner arms that were slit with a knife from below the elbow to the wrist (then turned toward the ground). A switch to an aerial view showed no additional blood dripping (while he was still alive). Also, blood would not pour out of his arms to the ground in a horizontal stream like it did. (00:02:04 - 00:02:27)
Continuity mistake: Annie's car's steering wheel is on the left side, but her dashcam showed her on the right side. Both hands appeared to be on/near the steering wheel (not adjusting the dashcam), followed by a brief view of her right hand playing on a keyboard, then returning to Annie who was now on the left side with her left hand on the steering wheel and a cigarette in her right hand. Also, when Annie was on the right side driving, there was no overhead light on above her head, but there was after she moved. (00:15:32 - 00:16:02)
Factual error: Despite the film being set in the 1990s, many cars made after 2010 appear in street scenes. (00:25:00 - 00:25:30)
Revealing mistake: When "Snowball" is sleeping on Lena's bed, it is obviously a "stuffed double" (stand-in). Snowball is usually partially hidden behind the dog (so breathing doesn't need to be shown/mimicked). The failure of Snowball to make even a slight movement is a giveaway (e.g, no ear movement when Lena starts talking), but even the stuffed lion, in itself, is not a very good replica - it simply looks fake. (00:33:44 - 00:48:20)
Continuity mistake: At the Internet Store, Spencer was told his house was "right outside" the service area, internet was not available, and a satellite would not work. At the Phone Store, Chad told Lynn and Zoe they were in the "dead zone." When Lynn answered Spencer's call by putting her head out the upstairs window, she said, "The service is great up here." Lynn and Zoe could listen to the news on their cell phone in the kitchen and Zoe read about asteroids just outside the front door. Internet worked? (00:04:53 - 00:28:00)
Other mistake: Mike said, "I don't feel too good [sick from drinking Mexico's "dirty water"]." Rafo responded, "Run! It's gonna come out" and Mike walked into the weeds. Mike apparently "forgot" about his impending diarrhea because he was able to run up to the road behind Rafo when their car was being stolen. (00:41:59 - 00:44:00)
Other mistake: "Boogie" was a HS student who didn't work and lived with his financially strained (heavily in debt) parents. The Chin family was receiving past-due notices for various bills. The IRS also sent a letter of intent to levy or seize their property if they did not immediately pay $4,513.29. But Boogie had money to buy marijuana, go out to dinner with his girlfriend, go to a gym, and visit a fortune teller - each multiple times. His mother also ate out and saw a fortune teller. With what money? (00:10:20 - 00:28:57)
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: 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)
Factual error: Sassoon's Military Cross medal is shown ending up thrown in the Mersey and sinking. In his own words from "Memoirs of an Infantry Officer", published in 1930 - "I ripped the MC ribbon off my tunic and threw it into the mouth of the Mersey. Weighted with significance though this action was, it would have felt more conclusive had the ribbons been heavier. As it was, the poor little thing fell weakly on the water and floated away as though aware of its own futility."
Factual error: Before Tom landed in the puddle, there was water dripping or it was raining on it, but it wasn't raining when he was on the rooftops. After Tom landed, the water drops/rain suddenly stopped. Even if the water drops were from earlier rain running off the roof or other parts of the building, they would not be hitting the whole way across the puddle or that far away from the edge of the building. (00:02:34)
Continuity mistake: There is no barn to the left of MacMasters' house (otherwise, it would be visible from the front porch), but when Albert runs from the side of the porch into the open, there is a barn. When Britt got home, there was a barn but it was not where it would have been when Albert was running from Jed's gang. (00:09:10 - 00:10:18)
Audio problem: When Charles knocked on the man's door to offer storm repairs, the sounds didn't match; they were slightly delayed, with the last knocking sound coming after Charles stopped knocking and lowered his hand.