So many.

Normal people get slammed into a wall by monster, explosion or whatever, stand up and walk away. Buddy, you don't walk that off. People die or need months of recovery from less.

Don't get me started on the speed force. You do some napkin math and see the Flash is taking on a 1000G running in circles close to mach 2 without blinking and then gets knocked unconscious with a single punch in the next scene. Flash is not the only one of course.

And the lone inventor developing a fully conscious AI in some mountain cabin on an old laptop. It was clear that would never work and reality now shown us AI companies looking into nuclear powered data centers to speed up things.

This happens with fire sprinklers a lot, one sprinkler goes off, and triggers the rest of the floor, or sometimes even building.

That's not how it works. Each sprinkler has it's own trigger mechanism, the glass bulb, and cannot trigger another sprinkler.

There are systems where this happens, but the sprinkler heads look very different, and you won't find them in an office building.

Person gets shot and they have to dig the bullet out to save them.

GI Joe movie where they blow up a sheet of ice on the ocean to make it sink down and destroy the base below.

In movies when there's a huge explosion in space, there's always this ring that comes out from the explosion. No!

In space the blast wave would be spherical: it only looks like a 2d ring when observed from a telescope many many light years away, since the telescope can only pick up the outside edge of the blast.

Edit: fixed auto-incorrect

Gotta be the "high noon duel" in western movies. That didn't happen much in the real wild west.

Citizens shooting at gangs during bank robberies? Yup.
Shootout at The OK Corral? Yup.
Lynching of accused criminals before a judge could come to town? Oh hell yes.

But that trope of lawman/outlaw facing off in the middle of the street for a prearranged gun duel just didn't really happen.

L shaped blankets.

https://tvtropes.org/pmwiki/pmwiki.php/Main/ModestyBedsheet

Keanu Reeves with a sword, standing in the middle of a pile of bodies. Bad guy enters the room carrying a gun. Bad guy sees him and rather than shooting him from a safe distance, chooses to run towards him, still holding the gun out in front of him, shouting at him rather than shooting at him.

Pouring gas over everything and lighting it by tossing a lit cigarette into the puddle. It does not work that way.

Just be at work and look around yourself. Many of your colleagues got their jobs without knowing what's actually going on. Doesn't matter what kind of job they have.