Deliberate mistake: In fight scenes, it's often one person against a small army. Despite having the person greatly outnumbered, the enemies proceed to attack them one at a time, allowing each to be easily dispatched. The whole point of having so many is to overwhelm your enemy... not take turns getting punched out.
Common movie and TV mistakes
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: Most ventilation ducts are not large enough for a person to crawl around in, and any duct large enough for an adult to fit in wouldn't be able to support the person's weight. In the rare event that a company could afford a large ventilation system that could support a person's weight, they would likely forgo it anyway, as it would pose a security risk.
Factual error: Enhancing an image by zooming in to blurry CCTV footage and somehow reading the reflection of a ticket in someone's pocket off a nearby fridge.
Factual error: People being in a vicious gunfight with no ear protectors and still being able to have a normal conversation afterwards.
Character mistake: People who run after cars when they drive away expecting to catch up with it on foot.
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Suggested correction: Generally, people aren't thinking too forwardly or rationally when someone they're pursuing is about to get away. Their lizard-brain just thinks "getting away -> chase," not considering how unlikely (though not impossible) it is for them to either catch up with the car before it fully accelerates or when it makes a turn, then either pull the driver out of the car or jump on the car.
Factual error: People taking cover behind very small / flimsy things, like car doors or wardrobes, dozens of bullets being fired at them, but they emerge unscathed.
Character mistake: In almost every film or TV show, if the villain actually bothered to kill the hero as soon as they met face to face instead of just talking about their plans, the villain would actually succeed in his or her plans. Instead, the villain letting the hero live becomes their real downfall.
Factual error: Airbags which deploy and stay inflated. That's not how airbags work, they deflate immediately.
Audio problem: Non-metal items making audible metallic sounds. The audible metallic sound effect of a blade, such as a sword, when it's being drawn from a wood or leather scabbard that doesn't have a metal throat, and also when it's drawn from a fabric or leather belt.
Factual error: True gun silencers do not exist in real life. There do exist what are called "suppressors," but they don't quiet the sound of a gunshot anywhere near what you see in movies and television shows.
Factual error: Snipers using a laser mounted to their rifle to line up their target. Snipers in real life don't use lasers in this manner. For one thing, it gives away their position, and additionally because lasers won't line up a target accurately at a long range, as the bullet is affected by gravity, the rotation of the Earth, and other factors.
Revealing mistake: "Hacking" something by hammering a keyboard and characters appearing they're nowhere near actually typing.
Factual error: All sprinklers going off at the same time in a fire or when an alarm is triggered - they actually go off individually and only when exposed to enough heat.
Character mistake: In many space-based action sequences, all the craft involved act like space isn't 3D. Ships fly at each other head on, surround other vessels in a circle, not a sphere, attack with a pincer movement from the left and right, rather than above/below, etc. Most of the time the action is all broadly on one plane. Makes things easier to understand from an audience perspective, makes zero sense tactically speaking.
Factual error: In many films and TV series that feature passwords being cracked by a "brute-force" attack, individual characters of a password are found independently of each other. (See Ocean's Eight, Under Siege 2, various episodes of Alarm für Cobra 11 - Die Autobahnpolizei, or Person of Interest.) In reality, this is impossible; most of the times the password itself is not stored anywhere. Rather, an irreversible cryptographic hash of the password is stored, and the typed password's hash is compared with that. Either the whole thing is right or no access is granted.
Other mistake: A common error for Batman films, despite Gotham City being a large and heavily populated city akin to New York or Chicago, Batman never gets stuck in traffic. In fact, whenever Batman is shown driving through the streets of Gotham, there is little to no traffic at all.
Deliberate mistake: You don't automatically get "one phone call" when you're arrested in the USA. Depends on the state, for a start. You're always entitled to access to a lawyer regardless, but not always making the call yourself. If you make a call with no-one answering, you've not "wasted" your call either. Plenty of states allow multiple calls, within reason. It's a plot device, not based in reality.
Factual error: IP addresses are 4 groups of up to 3 numbers each, maxing out at 255 - it's a fundamental limitation of the technology. But IP addresses in movies are often shown as something like 564.100.432.165, which is impossible. This isn't like movie phone numbers all starting with 555, because that's still a feasible phone number, just with a "movie" area code.
Factual error: In movie plots that take place hundreds or even thousands of years ago, the characters have perfectly white, straight teeth. It is a known fact that Queen Elizabeth I was virtually toothless by age 40. Good dental hygiene didn't really exist until after WWII. Some movies get it right, but only for the bad guys.
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Suggested correction: False teeth have been around for centuries; they could be made from a variety of materials including wood, porcelain, or even human teeth taken from corpses or people who willingly sold their teeth to make some quick cash. People with the means to do so could acquire them quite easily, and they were often indistinguishable from a person's own natural teeth.
Your reasoning is very weak. Yes, false teeth have been around for centuries, but even today with much better technology, with close observation you can tell someone has false teeth. Everyone knew G. Washington had false teeth. No, these characters from 500 years ago are not ALL wearing false teeth.
Australian Aboriginals have (had, before colonization) almost perfectly white, straight teeth and it's known that this is somehow related with their foraging diet. If it's true, then most people back ago could have almost perfect teeth too.
Furthermore, widespread tooth decay before great age was only a rich person's problem until refined sugar became cheap, so the peasants wouldn't have bad teeth either.
Tooth decay is not caused by refined sugars. Any carbohydrates will promote bacterial growth, which can cause tooth decay. Additionally acidic food and drinks and alcohol (which can be high in carbohydrates) can damage the teeth and promote bacterial growth. And the mistake is talking about movies in general with countless characters, not a few select characters with significant means.
Thanks for your response. You said it better than I could have.
I mostly agree with you, but I am talking about characters who are rich with perfectly white teeth (and more importantly) great gums - no recession. What I disagree is that only sugar causes teeth decay. Not true. Virtually all food breaks down into simple sugars with enzymes in your saliva.
Other mistake: When someone is working on a car or changing a wheel they always manage to keep their hands clean.
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