Continuity mistake: Nora's car crashed through the garage door or wall, leaving a trapezoid-like shape with curved sides. The few flashes of the same during the scene were enough to perceive the differences in the shape of the hole she caused. At one point, it was almost square. A little later, the hole in the door/wall was about twice as wide, resembling a rectangle but with a dome on the right side. (00:25:35 - 00:26:02)
Continuity mistake: The position of the sword on the table varies. The doctor originally set it roughly parallel to the edge of the table, but sometimes it was at an angle. Also, the ribbon where the blade meets the handle usually has a prop on it to keep the handle raised. (00:19:34 - 00:22:06)
Audio problem: At the end of his interview, the side-rear view of Evan did not show any mouth/cheek movements when he said, "You think you know my story" and "Thank you for your time." (00:10:52)
Deliberate mistake: Nora's car smashed through the (almost floor-length) windows in the police station and exited the building airborne - and stayed airborne long enough to clear a police car parked alongside the building (or curb). (00:27:05)
Character mistake: When Toby said, "Cops found a sword on him [Evan]", he pronounced the "w" in sword, but it is a silent "w" (not pronounced). Sword is correctly pronounced like "sord" or "soared." (00:18:28)
Factual error: Treadway used his rear tire to fling a standard sized brick into the path of the police car chasing him. The brick (which weighs between 4.5 - 6 #) not only broke through the police car's windshield, it proceeded to break through the rear window, plus apparently gained enough speed and upward curve to break through the next police car's windshield. A brick flung at an upward curve would not break through a windshield and take a linear path through the car and break the rear window, etc. (00:04:18)
Character mistake: Evan's response to "What's gunpowder made of?" was "74% potassium nitrate, 13% charcoal." A "smart man" who "knows everything" should realise that the two total 87% and there's a third ingredient (surfur) needed to comprise the remaining 13%. Gunpowder does not have a single "recipe", so the % of the 3 ingredients can vary. Generally, 75% potassium nitrate (or "salt peter"), 15% charcoal, and 10% sulfur may translate to 74.8%/13.3%/11.9% respectively. The 74.8% should be rounded up, not down? (00:14:00)
Character mistake: The interviewer pointed out that Evan [Mark Wahlberg] is a "smart guy" and another man later said, "Homeboy knows everything. He's a freak." When Evan was telling the interviewer the circumstances under which he assaulted a man, Evan committed a basic grammatical error - a misplaced modifier: "I asked him to leave politely." Evan didn't mean he wanted the man to leave in a "polite manner"; he meant he "politely asked" the man to leave. (00:09:20 - 00:14:00)
