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Continuity mistake: Isaac is wearing tan or khaki pants but the video of him getting "beamed up" to the spaceship shows dark blue pants. (00:18:15)

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Continuity mistake: Mr. Butler returned the paper Lucas wrote ("A Defense of Iago"), but it is back in his home office when he uses it to highlight words in it that were also in the paper he believed Lucas substituted in his application to fill a professorship position. (00:35:37)

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Continuity mistake: Mr. Butler parks his car close and parallel to his house. The night/morning Lucas slashed his tire, the car was parked away from and perpendicular to the house. It is worth mentioning that instead of Lucas going on the passenger side of the car where he would be hidden between the car and the hedges, he slashed the tire out in the open where he would have been more likely to be seen and caught. (00:27:15 - 00:28:30)

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Continuity mistake: The egg sandwich was not sliced, but when Harley opens one end of the wrapper, it has been sliced (with the sliced edge facing outward). When the sandwich flies in the air and lands on the street, there are four pieces of roll, which indicates it was sliced. However, when sandwiches are sliced in half, the half is not turned around like it was when Harley first opened the wrapper and was about to take a bite. (00:13:08 - 00:15:46)

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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)

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Trivia: All the original main cast members were in this movie except Susan Olsen ("Cindy"). Jennifer Runyon took her place. Two possible reasons that Susan/Cindy didn't participate: filming conflicted with her honeymoon to Jamaica and she was offered less money than the other cast members.

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Plot hole: Detective Speck essentially believed everything that Lucas told him about Mr. Butler's "love relationship" with Becca. The detective took the word of a student over that of a teacher and by using what could hardly be called an "investigation." This trusting of what a new high school student said, especially in combination with the teacher's denial, is extremely poor and inexcusable behavior on the part of a detective (who appeared to be old enough to be quite experienced and even retire... years ago). Believing the word of Lucas fed into the plot that Lucas was a sociopath - capable of fooling a seasoned detective and thereby remaining uncaught and not exposed for what he really was - and help build suspense.

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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)

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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)

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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)

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Trivia: Lucas told Mr. Butler that his mother died when he was very young. Assuming this is true, when his dad asked him, "Is there anything you want me to tell your mother for you?" his father was planning on committing suicide or believed Lucas was going to kill him. (The empty prescription bottles suggest suicide). (01:12:48)

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Other mistake: Jack's slap across Nick's face didn't make contact. (01:25:40)

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Trivia: The real men and teacher are shown after the movie.

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Other mistake: The courses on Lucas' grade report are not given numbers or specific titles that would distinguish them from other courses (and levels) within a department. They are listed in general categories: "American History" (a minor distinction), "Calculus", "Chemistry", "English", and "French." A cover page for one of Lucas' assignments shows he was enrolled in "English 301" - still no descriptive title, but at least discernible from "English 101" and "English 201." (00:23:00 - 00:51:54)

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Continuity mistake: Lucas received his mid-term grades in the mail BEFORE Mr. Butler actually entered his grade on the computer. Lucas got the mail and took his unopened grade report to his bedroom then the camera shifts to Mr. Butler contemplating what grade to fill in for Lucas. Mr. Butler made the entry (grade not shown) and closed his laptop. The camera returns to Lucas, who opens his mid-term grade report and sees the "F" from Mr. Butler. (00:51:21)

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Continuity mistake: More than once, the Tabasco sauce lid is removed and not put back on yet somehow gets back on before it is removed again. First, Nick drops the lid onto the counter and doesn't pick it up before taking his soup to the table. Jack goes to the counter to get the Tabasco sauce, sits down, then takes the lid off and drops it onto the table. Nick is soon seen holding the Tabasco sauce bottle and, once again, removes the lid. (00:52:49 - 00:53:44)

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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)

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Trivia: "Aggressive driving" and "Road Rage" are not the same thing, but there is some overlap: Not all aggressive driving is road rage, but road rage is an extreme form of aggressive driving. In general, aggressive driving (such as tailgating) is classified as a traffic offense or summary offense (typically punishable by a fine but can result in suspension of driver's license and possibly include a short jail sentence) whereas road rage is classified as a criminal offense (and also falls under civil offenses or torts) because the intent is to cause harm. Road rage can take the form of an aggravated assault by vehicle (felony offense); less serious incidents are sometimes written up as "reckless driving", lowering the classification to a summary (traffic) offense. When a driver becomes angry, wants to cause harm to another person/driver, and a person is injured, the driver's behavior is deemed violent and subject to criminal prosecution as a felony offense.

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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)

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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)

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