Deliberate mistake: The criminal tells his evil plans to a priest, who is then unable to prevent a crime because of the "seal of the confessional." Yes, priests may not tell another what is heard in confession, however the 'seal' protects only those who seek absolution for past sins. Confessionals are not boxes into which you can tell a priest your dastardly plans and they can't do anything about it. There is no seal on this misuse of the confessional. Examples include 'Priest' (1994).
Common movie and TV mistakes - page 4
This is a list of mistakes, things done wrong, etc. that happen so frequently onscreen we barely notice any more. 'Movie logic', stupid behaviours, and everything related.
Factual error: Protagonists who have been able to clear their name after being framed, but only in the process of committing several other crimes, for which they receive no punishments. The law is still the law and crimes are all separate from each other committed in that time period.
Suggested correction: This can be true or not. Prosecutors have a lot of discretion whether to prosecute a crime of not. If you help the police solve a crime that you were originally a suspect by committing another crime, as long as that crime is not murder (it can be self-defense) the prosecutor has discretion whether to prosecute.
Plus, in the case of common mistakes, they are not working with the police to clear their name. And just because they're not murdering people doesn't mean they're not assaulting people (outside the realm of self-defense). Plus, this common mistake is especially true for police officers kicked off the case and then break all sorts of police procedures with no consequences.
The only point I am making is that prosecutors do have discretion whether to prosecute crimes. If the crime is minor AND you helped the prosecutor with other more serious crimes, they can choose to not prosecute you for the minor crimes. The OP was vague as to what kind of additional crimes they committed. If murder, then I don't see how they get away with that just because they helped solve other crimes. It would depend on what kind of other crimes the protagonist committed.
Factual error: Whenever police officers are involved in some kind of shooting while on duty, they are always kept on the case. They're never suspended or investigated by internal affairs. In real life, there's a full on investigation that takes months to make certain the officer in question was justified in the shooting, not to mention the intense media scrutiny surrounding the incident.
Factual error: Padlocks being shot off or unlocked by gunfire.
It takes more than an experienced shooter to shoot open a padlock with a gun. You need to use the right gun, and the right bullet.
An experienced shooter will never take the risk of a ricochet or shrapnel from doing such a thing.
Factual error: It's common in movies and shows, and even games sometimes, to see characters effortlessly lifting manhole covers. Usually when climbing out from them or even just walking up and lifting them with bare hands. In the case of the TMNT, where they have enhanced strength, it's a little more believable. However, in real life these lids are super heavy and usually require a crane or other heavy equipment to lift.
Factual error: Lawyers making a scene in the courtroom, such as raising their voice or being forceful/threatening with a witness. This sort of behavior is never allowed. Even when the attorney has permission to treat a witness as "hostile", it doesn't mean they can scream and yell. Courtroom trials are in general very quiet affairs. Any emotional outbursts by an attorney could lead to a mistrial, as this sort of behavior can influence a jury. An attorney would never be given enough leeway to badger a witness until they break down and confess to a crime on the stand, no matter what evidence they present during questioning.
Other mistake: People are often seen knocking on someone's door only for it to be answered with 2 or 3 seconds regardless of the size of the house. The house could be the size of a mansion or a little 1 bed flat and response times are always around the same. 2 - 3 seconds.
Factual error: Characters living in an expensive city (such as New York or San Francisco) and somehow being able to afford a spacious apartment that their job couldn't realistically pay for.
Factual error: In movies, TV shows, cartoons, and videogames people are often depicted as standing right next to molten lava or magma. Frequently walking or fighting next to it, getting inches away or only a few feet above it. In reality the heat coming off it alone would cause people's clothes and skin to catch fire and burn their lungs just from being within like 20 feet of lava.
Character mistake: Characters will often tell other characters information they already know or overload them with far more information than they need or would even be natural to say or come up in conversation simply for the sake of exposition for the audience.
Character mistake: "Romantic" gestures which would actually get you arrested for stalking. Tracking down where someone lives and trying to sneak into their back yard with a bunch of flowers would get the cops called on you, not invited in for coffee.
Revealing mistake: Actors supposedly playing instruments in a scene but their hand movements don't match the music.
Audio problem: Guns making mechanical clicks every time they are moved, especially to show the hero is being threatened. Guns generally do have components that click e.g. the safety catch, but they have to be manipulated by the person carrying them, which is not what we see on screen.
Factual error: When an indoor fire occurs, sprinklers often start spraying in the entire building. In reality, though, only the nearest sprinklers (those who got hot enough) will start sprinkling. This is to avoid unnecessary damage in real life, and to focus the available water on the most needed place.
Factual error: Films depicting criminal trials in American courtrooms frequently show the defendant receiving their sentence right after their guilty verdict is rendered. In real life, people found guilty will have a separate hearing to receive their sentence several weeks later.
Character mistake: Soldiers leaving the foldable stocks of their weapons folded, despite knowing that they are going into a combat situation. Particularly affects the MP-40 wielded by the Germans in WWII movies, but also some modern examples like the MP5 and the G36. Automatic weapons are difficult to control at the best of times, there is no reason a trained soldier would deprive themselves of this extra bit of accuracy.
Factual error: The importance of leaving a crime scene undisturbed is greatly exaggerated in films and TV. Crime scenes are often disturbed deliberately by responding police officers. Immediate safety and the preservation of life are paramount to all other concerns. If a body is found, the scene must be secured to be sure a suspect is not still present and the area is safe; this often involves searching through the scene itself. The body must also be inspected to be certain the victim is deceased and doesn't require medical attention; this act often involves moving the body. The idea of police stopping anyone from going anywhere near a crime scene until forensic examiners arrive is a movie cliche not based in reality. It is rare, to the point of being almost unheard of, for a criminal case to hinge on the positioning of a dead body or the exact location of evidence in a room.
Revealing mistake: After somebody gets run through with a sword, knife, spear, etc., and withdrawn from the stabbed body, there is no blood, gore, etc., seen on the blade.
Other mistake: Helicopters appearing from out of nowhere and surprising characters. Helicopters are loud enough to be heard from a considerable distance and will also vibrate the ground/buildings/homes if they are flying low enough. The only feasible way a person can be surprised by the sudden appearance of a helicopter would be if they are deaf.
Factual error: People often jump from great heights into bodies of water and avoid fall damage. But the surface tension of water is great enough it would be no different than hitting concrete if you're high enough up.
Suggested correction: If you jump in feet first you can survive a jump into water from a very great height without injuries.
About the max distance you can fall into water without injury is 65 feet, even at feet first. Professional high divers even struggle to control themselves from that height without doing actions they can control like flips. An untrained individual leaping from a bridge down into water would most certainly kill them in real life.
To dive for up to 90 feet is an official sport, while daredevils dive from up 120 feet. And "dive" means head first. Normal people can and do jump feet first without injury, although is a coin toss. Certainly fatal bridge jumps are from very high ones (The Golden Gate is something like 250 feet).
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