Electrical shocks applied to asystolic hearts to restart them is a classic.

The shock serves to stop fibrillation and to induce a rhythmic firing of the neves, that's why it's called defibrillation. Fibrillation is random firing of the nerves, asystole is no firing.

If I recall correctly my father told me you use an injection of adrenaline for asystolic hearts. Kind of like in Pulp Fiction. Though I think injecting directly into the heart isn't the preferred method anymore.

I always think its funny how bullets never seem to penetrate anything in movies. Like, guy hiding behind a barrel? Nope, cant penetrate, even with a rifle. The newest Batman movie had me shaking my head as he shrugged off multiple rifle rounds to his armor.

Bullets are insanely dangerous and powerful. A .223 round can penetrate a solid brick wall pretty easily, and can destroy a cinderblock wall with some effort. Even if it doesnt penetrate, the amount of force applied is incredible. Plates designed to stop bullets have to be made in specific ways to make sure a bullet doesn't penetrate, but even with that plate, the sheer force of an impact can break bones.

As a counterpoint to the excellent examples posted here, I will cite an example of the opposite that I appreciate: In the Big Lebowski when the Dude goes to retrieve his stolen car and he asks the cop if they have any leads. The cop's reaction is both realistic and absolutely hilarious.

There’s a trillion ones around unrealism, so I may as well pick something that would be more enjoyable if fixed.

Professional chatter. Let’s say a team of 30 scientists have been trying to communicate with a dimensional portal for 5 years. They wouldn’t be using speech like “Identity verified. Doctor Faris, you are clear to approach the anomaly.” Often, they’d have extremely abbreviated lingo for everything they need to express that happens on a daily basis, and otherwise are chatting about other stuff.

“Ok, approach endorsed. Bob wasn’t so chatty yesterday from what I heard, we’ll just aim for 2 logic points for this cycle.”
“Ryan was suggesting we spread the cycles. Bob has to sleep sometime.”
“Yeah, 90% of us would rather listen to Ryan than Mick, but Mick signs the checks.”

So the only actual order comes from some obscure phrase like “Approach endorsed”, which they may only say verbatim for safety reasons. The rest is just workplace banter about how best to accomplish their task, none of it being essential. EDIT: And, to make clear, in the above quote, Bob is the portal/anomaly.

Where in countless mystery/thriller stories bad guys arrange meets in huge open deserted buildings, to be uninterrupted. In the real world, the place will securely locked and gated, or multiple houseless people will have already moved in there.

The film Under Siege II has some of the best hacking scenes and dialog.

Even at a young age, the line "This is the guy that hacked into the Pentagon with a laptop" made me WTF because unless you're brute forcing encryption, the kind of computer you use to backdoor a system is irrelevant.

A more mundane one, but people on reasonably normal incomes living in a house that's at least one order of magnitude more expensive than they could ever afford even if they purchased it twenty or thirty years ago. Its particularly bad in things set in expensive areas like London or New York or Tokyo. Like being able to afford a house in central London rather than renting a flat with three other people takes substantial money, you aren't going to be afford that if you work in a supermarket.

The ones that really get me are the way they show execs at companies. The "look, this character is so bad ass at being an exec!". They always come off as so unrealistic and cringy.

I've swam in that ocean, and that's not how that shit works. Engineering too. In reality, it's always a team of engineers that get something done... It is NEVER some rich smart guy inventing stuff on his or her own in their super fancy workshop.

How night and day work above the Arctic Circle.

Movies and TV and stories talk about how there's 6 months of daylight and 6 months of darkness. That does not fucking happen. This is still part of storytelling to this day (I'm looking at you, Sweet Tooth season 3).

Days get stupidly long in the summer, and there's a while where the sun really doesn't go down. in the Winter days get stupidly short, and there's a while where it doesn't really come up all that much. But it's not 6 months of one and 6 months of the other.

(edited for clarity)