Plot hole: In situations where the protagonist is framed, they will be firmly believed to be guilty by everyone despite the lack of sufficient evidence. This is often achieved by focusing more on motive or odd circumstances that make the hero look guilty, rather than the little evidence which could establish reasonable doubt, with some evidence even being inaccurately seen as proof of a crime. It's a plot device for the hero to solve the mystery by themselves for dramatic purposes.
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.
Plot hole: Movies in which the protagonist isn't believed is often exaggerated to the point of crushing suspension of disbelief. Most times, other characters will not even give the protagonist the slightest benefit of the doubt and may even be needlessly angry for even suggesting that the "very loving and considerate nice guy" is actually a bad person. The Good Son and Orphan are classic examples where the villain is believed over the hero, despite there being no evidence to contradict the hero's claims.
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.
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.
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.
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