Deliberate mistake: The "flow" from Fred (Rachel's brother) urinating while strapped to a chair was not what would be expected. His pants would absorb the urine, so urine would not flow to the floor like from a faucet or large streams drip straight down and form a puddle beneath him. (00:57:06)
Continuity mistake: The amount of rain on The Man's shirt is relatively light when he reaches the doorstep but his shirt was saturated before he even started going up the sidewalk. He was in the house for a couple of minutes to kill the two people and set the house on fire (not enough time for his shirt to dry) yet his shirt was almost dry when he exited the house. The Man's shirt got soaked again on his way to his truck. The shirt looks dark blue when saturated with rain but light blue when it is dry. (00:02:53 - 00:03:51)
Continuity mistake: A few minutes after 4:00 AM, Tom whacks the front door with a hatchet / tomahawk - almost instantly an upstairs light is turned on, and by the time it takes for Tom to take a couple steps into the house, the boyfriend and ex-wife are just feet away from Tom. The two people inside the house somehow managed to instantly wake up from the bang on the door plus travel half-way across the house and go from upstairs to downstairs without using the "vertical" staircase! The distance they covered in such a short amount of time (a few seconds?) was absurd. (00:00:47 - 00:01:36)
Other mistake: Fred was doused with lighter fluid and set on fire while strapped in a chair and his entire upper body was subjected to intense flames for at least a couple seconds. The chair was shoved several feet toward the door where a police officer was standing and started trying to smother the flames before they were off camera, but it can be assumed that it would take a few more seconds (at the least) to extinguish the flames. If he survived, Fred would have extensive burn scars, disfigurement, excruciating pain, have to undergo an unknown number of corrective surgeries, and face long-term rehabilitation. Later that day (within a few hours?), Rachel received a phone call and told her son Kyle that his uncle Fred was "going to be okay"! It was way too soon for anyone to know that and it defies logic. (00:59:30)
Other mistake: As soon as Tom chops his way through the front door to commit the murders, a "flight of stairs" can be seen. These steps are obviously a prop because they are linear and vertical (are flat and go straight up to the ceiling) and the people inside (ex-wife and new boyfriend) emerge from behind the "staircase" with little space to the wall parallel to the steps. (00:03:07)
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)
Other mistake: Tom is driving a stolen minivan with custom plates reading ROSIES. Later, you can see the minivan from behind when Tom is driving through the residential neighborhood. The plates are not the same.
Visible crew/equipment: Before the tablet conversation, the camera car is reflected multiple times in the Volvo, particularly the rear of the vehicle.
Continuity mistake: In the beginning, when we see Rachel's friend driving the 4x4, the last 3 letters are TEL. But later, when the guy at the filling station goes and gets the plates for Rachel, they read TPX.
Continuity mistake: When the 4x4 truck pulls alongside the Volvo the first time, the kid's window rolls down, then won't go up, then it's up, then down, and the kid has to push it up with great effort.
Continuity mistake: Near the end car chase, a van hits another vehicle but there is no damage to it right after that.
Continuity mistake: Rachel's hair and the amount/location of loose strands of hair are quite inconsistent throughout the movie. The gas station/ convenience store scene, in particular, shows a lot of variation while inside standing by the cash register. Strands from her hair (not really bangs) go diagonally across (from right to left) her cheek and sometimes down her neck or even to her lip. Strands of hair also hang down from in front of her ear and the back of her neck (while hair is tied up in a bun). Almost every time the camera returns to Rachel, the messiness of her hair (dangling strands over her face and neck) changes. (00:28:28)
Continuity mistake: As Rachel approaches the gas station, the road is divided by an intermittent yellow line, but it is a solid yellow line when Rachel is getting into her car to leave. The road also varies in wetness, sometimes being quite wet but other times dry (er). A quick change from wet to dry occurs when Tom runs down the male customer who tried to help Rachel. (00:28:18 - 00:31:49)
Continuity mistake: A front view of the house showed there were no lights on before Tom broke inside. After Tom whacks his wife's new boyfriend and then is heard off-screen killing his wife, there are still no lights on in the downstairs room to the left of the screen. Tom comes back into view by the front door and pours gasoline around the room to the right of the screen and sets it on fire. When Tom comes out of the house, the light is on in the room to the left of the screen. (00:03:27)
Revealing mistake: Tom drives at least two differently equipped Ford 4x4 Supercrew trucks. In particular, there are two different grille guards, with one being smaller and less protruding than the other, as well as less-menacing looking. Although inconsistently used, the switch to a grille guard that can cause less damage is used at the gas station when Tom runs into the guy who tried to help Rachel get away from him and when ramming the rear-end of Rachel's Volvo. One truck has fog (or running) lights below the grille guard, making the two differently-equipped trucks more noticeable/discernable.
Other mistake: In the angled side view of Tom sitting in his truck behind Rachel's Volvo at the gas station, a light-colored car appears from the rear of Tom's truck and can be seen going past Tom's side mirror. A car this close at the angle it was traveling would most likely be headed straight toward and smash into the white building across the street from the gas station. The car should be running parallel to Tom's truck; it is too far away from the intersection to go onto that crossroad. (00:31:24)
Other mistake: Rachel drives a Volvo V-90 (wagon) and Tom has what appears to be a Ford 4x4 Supercrew with a large black metal grille guard. (Distinguishing features on the truck are absent except for a small Ford logo largely hidden by the grille guard; even the area below the dashboard is blackened.) Tom rammed his truck into the rear end of Rachel's Volvo several times. The first bump was not very hard, but the next four were. The top of the grille guard is high enough to reach the bottom of the cargo window but the window did not break. There should still be extensive damage to the rear end of the Volvo. Viewers do not get to see the rear end immediately after it was rammed (00:33:49), but there is a quick rear end view later. The Volvo has a soccer ball-sized dent on the right side by the tail light and a few small black scrapes on the bumper. This doesn't match the damage that would be expected, and - more significantly - the Volvo already had that damage BEFORE being rammed by Tom. (00:24:07 - 01:01:45)
Continuity mistake: Before Tom exits his truck to break into the house (ex-wife's or her new boyfriend's), he has what appears to be a smartphone (or other flat rectangular object) in his shirt's left pocket but it is not in his pocket when he exits the house. (It is not likely that he took time during the bludgeonings to remove the object from his pocket and leave it behind at a double-homicide scene and the victims were not able to fight back and knock it out of his pocket). (00:02:35 - 00:03:52)
