Factual error: The "hard suits" the divers wear have soft, relatively normal gloves and soft joints. More akin to a football uniform with armor over spandex. They are at the bottom of the Mariana Trench, at 36,0000 feet below sea level. The pressure is over 7,000 psi. Without a hard suit, they would instantly be crushed.
Factual error: The Corvette owned by Bentwood is not a Z06 as shown in the movie. It is a 2014 C7 Stingray and can be identified by the Stingray logo on the side of the car.
Factual error: Smaller pieces of the comet start raining down in a highway setting. While small fragments of a comet can come down, they'd all be traveling at anywhere between 20 miles per second as the comet is an extra-solar comet. Those small pieces wouldn't make such piddling explosions, they'd be creating concussion waves that would rupture your organs and send vehicles flying. The heat even from those small rocks would ignite all foliage within 50-100 yards. (01:31:00 - 01:34:00)
Factual error: When first sucking a bullet from the wall into his gun, he then opens the previously empty magazine to find the bullet. Given he didn't work the slide (forwards or in reverse), the round should not be in the magazine, but in the gun's chamber ready to fire. (00:14:00)
Factual error: SPOILERS! While the ending of Al being arrested for murder at his own wedding is dramatic and cathartic, it wouldn't have happened that way. There's no way that the cops would have known to search the wooded area near the cabin; they would have needed to find physical evidence linking the cabin to Al; they would have needed to establish that Al had no alibi for the time in question; etc. None of that would have happened that quickly or that quietly.
Factual error: The USMC Embassy Guard is an enlisted Marine Sgt. He is wearing a Commissioned USMC Officer's cover (hat) that has gold braid and gold oak leaf motifs on the visor. (01:20:15)
Factual error: The Blackledges' car has a license plate that starts with 34. Montana uses the first two numbers on their plates to identify the county that the driver lives in. 34 is the number for Sheridan County which is in northeastern Montana where there are no mountains in sight, but the Blackledge ranch is set near the foothills of a mountain range as you would see in western Montana.
Factual error: The soldiers had 506 Regiment's helmet markings of the 101st Airborne, and on their sleeves the 82nd Airborne and 1st Division shoulder patches.
Factual error: It is later revealed that Detective Banks partner faked his death by killing a meth-head junkie with the same tattoo as him. He included the junky's filleted skin with the same tattoo in a box with his badge to make it look like the other kills. Police, firefighters, first responders all provide DNA into a data bank to be identified in case something tragic happens and their remains are recovered. William Schenk's DNA would not have matched that of what was in the box.
Suggested correction: William knows that the cops will find out that he's not really dead one way or another. After all, he literally confronts Zeke and reveals he's still alive, knowing there's a good chance Zeke wouldn't take his offer to join him. All he's really doing is throwing off the cops and buying himself a few days when they think he's dead. (Since it can take a few days for DNA analysis to happen.) By the time they figure out he's not dead, he'll have already finished his game and disappeared. Which is ultimately what happens... he finishes his final game with Zeke and Marcus, then gets away.
Factual error: When Armando fired the M141 SMAW-D from the helo, there was no back blast out of the other side, not to mention the other man is the back would have maybe had his face blown off from the back blast also. (01:20:10)
Factual error: In the opening scene, Tom Cooper ("The Man") uses a hatchet or tactical tomahawk to break through the front door of a house and then bludgeon to death his ex-wife and her new boyfriend. The boyfriend was whacked over the head one time and, after falling to the floor, two more times with The Man leaning over his body. The man proceeded to the adjacent room to bludgeon his ex-wife an unknown number of times. He was able to exit the house with no visible blood on his body or clothes, which would be impossible after bludgeoning two people with a hatchet or tactical tomahawk. (00:03:15 - 00:04:02)
Factual error: Apex, played by Robert Maillet (a retired professional wrestler 6'11" and 350 pounds), forcefully slams Becky (played by 5' tall fifteen-year-old Lulu Wilson who probably weighs under 100 pounds) horizontally with her back hitting the ground from waist-high yet Becky is able to get up with no incapacitating injury that would be expected. Becky also manages to brutally kill him (as well as the three other neo-Nazis).
Factual error: The pilot is flying from the left-hand seat. Helos are flown from the right side. (01:23:00 - 01:25:00)
Factual error: The calendar at the end shows 3rd September but the radio announcement is of the declaration of war which in the UK was 1st September.
Factual error: 1. Turntables used by radio stations have no repeat play function; they are strictly manual operation. 2. Even if they did, continuous play of one 45rpm record would have eventually elicited a skip, and later the complete wearing through of the vinyl by friction of the needle. (01:25:40)
Factual error: It would not be possible for Kyle to see the woman breast-feeding - and certainly not as shown. Kyle was driving an SUV in the left lane and Swin was the front-seat passenger. When a car was approaching the SUV from the right-hand lane and the rear passenger area was approximately side-by-side at the SUV's passenger window (which is DARK-TINTED!), Swin looked toward the car, but his face was right in front of the frame around the windows - he would, at most, see the woman's left shoulder... and the baby was feeding "on the right." I doubt Kyle would have been able to see any part of the woman when he turned his head to look. At most (and this is unlikely given the height of the SUV), he might have gotten a partial glimpse of the woman's left shoulder and only after the car she was riding in was in front of the SUV's windshield (but still in the right-hand lane). (00:07:20)
Factual error: The manner in which "Hamby" fell into the hole (or well) did not reflect physics or reality. He was running/chasing Joey and Matt. Whenever one walks or runs, one's feet are never straight down together (like standing), so only one foot could have been over the hole or failed to clear it. Hamby should have tripped and fallen over (face forward) with his upper body landing past the hole. This should have kept him from falling straight down into the hole (as if dropped from above the hole).
Factual error: During one scene, a police siren can be heard in the background. However, this was 1960/1 and police sirens were not introduced into the UK until 1963. Before that, police cars had bells.
Factual error: After Maya Peters is brought into the recompression chamber because of an injury, the timer is shown counting down by hundredths of a second and skips from 1 to 0 without showing 0.99-0.01. (01:24:30)
Factual error: Rich told Jamie, "There was a car accident. Guy came in. I cut when I should've stitched or stitched when I should've cut. I don't even know. His family sued in civil court, and I lost everything." A doctor working at a hospital would have been required to carry malpractice insurance, which would have protected him from "losing everything." Also, it would be difficult to prove that a car accident victim who died during surgery was a victim of malpractice; most cases are settled out of court. (00:38:30)