Basically everything and anything to do with mental health/psychology. People with Dissociative Identity Disorder (or "Multiple Personality Disorder" as it used to be known) do not have "evil" alters. DID is also not the same thing as schizophrenia. OCD is often not focused on hygiene or cleanliness. Antidepressants aren't "happy pills," and while emotional blunting is a possible side effect (not the entire point of taking the medication!), it's often a sign that you're on the wrong dose or the wrong medication. People don't typically self-harm because they're suicidal. Eating disorders don't always have a focus on body image and anyone of any body size can be affected. There's no singular mental illness that causes people to be abusive or violent, and mentally ill people are more likely to be victims of violence than perpetrators. Etcetera.

Hacking/computer programming. They type wildly fast while shouting things.

Most of it looks like this but infront of a monitor, scrolling the wheel occasionally.

The “American hero” trope. No such thing.

Usually bad guys with guns can actually aim those guns. Or at least if they can't the fact that there's 50 of them means that eventually one of them will hit you.

Pretty much everything

The good guy winning.

Firearms in general.

Supressors as well. If two guys were walking through an airport shooting at each other everyone would still know it. Also a suppressor has a pop on the first shot.

If you have your firearm knowledge from movies and TV you don't know anything except what Hollywood wants you to think.

In anti-authoritarian movies, they don't go beyond what happens after the revolution or "the day after" as Slavoj Zizek always say. Unfortunately in real life, post-revolutions do not always lead to a happy ending. Just ask most of post-colonial states. Only a handful succeed and become prosperous and secure.

Getting knocked unconscious.

How big a house an average person can afford.

Guy gets shot and the impact sends him flying across the room, out the window, etc. Physics says “oh hell no”. The guy who fired that shot would have likely had his arm dislocated from the recoil if he was able to even hold onto it.

Giving birth. In movies and TV shows it's always this sudden thing. Like "My water broke! The baby is coming!" then there is some pushing and screaming and bam, baby. In reality, having a baby takes many many hours and often times days, even with induced labor.

The fight scenes, most people would die. In the movies they walk away.

CPR

the classic : no cleanup after sex

Romantic relationships. Way too much stalking and abuse of power. Far too many very large age gaps. All that stuff.

How heavy a full cup of coffee feels. The actors always treat it like the cup is empty. Liars!

How comfortable people are dragging their nice clothes/long coats/shoes into water and mud. How many times you see a woman in a period piece with this long flowing dress, traipsing through a big muddy area and not even attempting to hold her dress up out of it. like, c'mon, man. People in movies just don't care about having wet socks I guess.

Running over a cliff and only start to fall once realizing that you just ran over a cliff.

That's not real, you fall immediately.

Memory loss/amnesia. It works as a plot device but how often it shows up in media makes it seem like, well that’s what happens when you get bonked on the head. Amnesia is actually pretty rare.

CPR/shocking: I was so grateful that Dr. Robby called this out on The Pitt, you can’t shock asystole (flatline). Well, you can but it’s good for fuck all. I get why CPR is done poorly, if you do it for real you’re probably gonna break ribs. But they could do it as fast as it’s supposed to go at least. The dramatic pushes 3 seconds apart is also good for fuck all.

Hacking.

History

The relaxed position of mammalian eyelids leaves them open. Muscles must contract for the eyes to be shut. Dead creatures cannot contract their muscles so their eyes remain open after they die.

You cannot shut their eyes for them by closing their eyes with your hand. Morticians place contacts in cadaver's eyes while preparing the body for a wake. Those contacts grip the inside of the eyelids so that they remain closed.

This is why some cultures have funerary traditions in which objects are placed over the eyes.

TL;DR: you and your loved ones won't close their eyes when they die.

Movies and shows about legal disputes rarely show how long and dragged out they usually are

Distances in space.

Everything is further away that you can possibly imagine.

Loudness of gunshots. Every action hero would be deaf.

Archers being told to "hold". Nobody's holding a +100lbs warbow.

Sprinklers. In the vast majority of cases they react to heat - not smoke. They only go off individually rather than all at once and the water inside the pipes is black ink-like rust water sludge, not clear tap water.

Also another plumbing related: you don't need a huge wrench under the sink and drains are not pressurized so there's no water spraying anywhere when you mess with the p-trap.

Sex and relationships in action movies.

The whole "hot chick gets horny for the hero after a traumatizing couple of hours" thing gives a pretty messed up view of relationship building.