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I'm in IT. It gets comical.

Cups, too. Coffee mugs or other opaque containers will sometimes be used to gesticulate, and you can just tell from the way they move it that there's obviously nothing in it. They can't get away with it when the glass is clear, but if it's an opaque cup, more often than not it's completely empty and the lack of weight to it gives it away.

Sprinklers reacting to smoke - they react to heat.

All sprinklers going off at the same time - only the ones affected will.

The water spraying out is clear - it's black sludge.

A plumber using a huge wrench under the sink, usually working on the p-trap and then water starts spraying - you don't need a big wrench for that job and there is no pressurized water inside sewers.

Archers effortlessly holding their bows waiting for the command to all release at once - the draw weight of a war bow is so immense that you're physically unable to hold it for more than seconds.

People make plans to meet and never go over the details.. like a time, or a place. It's always missing some critical information you would need if you were actually going to meet someone

when someone is on a phone call on their mobile the screen is not showing the call screen.

Medical and psych. The beefy male orderlies in white tackling people. 10% of the time it’s like that, more so on a child or adolescent unit, but mostly it’s hey, let’s go talk over here about your feelings and come up with better choices and that works. Being heard, works. Most of the time, the orderlies wear street clothes. The shot is real but it goes in a muscle not the neck.

Empty casings not being ejected from guns. It doesn't even need to be shown - just splice in a sound effect, FFS!

Medical dramas often have the xray films displayed upside-down or backwards, also chess boards are nearly always set up wrong with either the pices in the wrong places or the board turned 90°

It's super minor, but I think the ones that annoy me the most are when they're showing an off angle of someone talking, but their jaw doesn't match the words. Normally it's to show the responders face.

I'm a pilot. Sometimes screenwriters do a pretty good job with aircraft, sometimes they extremely don't. They'll show the wrong instrument when talking about a reading (a vertical speed indicator pointing to 200 feet/min climb over dialog that says "descending through 2,000 feet) or ATC will clear someone to turn to a heading of 540 or clear them to land on runway three niner, and don't get me started on aircraft engineering.

There's a scene in The World Is Not Enough where James Bond shoots a powered parachute in the wing and we hear engine struggling sounds.

My favorite has to come from the movie Iron Eagle. Near the beginning, Louis Gossett Jr is tinkering under the oil dipstick door on a Cessna 150, and the following dialog is exchanged:

"How come you're making my mixture so rich?"

"As lean as you were running, if you went into a stall you'da lost your engine and you'd never be able to pull it out."

What the Appalachian cousin fuck are you talking about, Louis?

Videogames and boardgames. Videogames are always depicted as the players wildly buttonmashing and getting into weird positiona for some reason.

Boardgames are not as common, but if they are they have glaring issues if they are made up or not played correctly if they aren't. The only pefect example of doing it right i know of is hokagou saigoro club, which uses real boardgames and explains them in detail. You can play some of those games without reading the rulebook if you watched the show or read the manga.

Daredevil: Born Again - Subway platform with no security cameras.

Guy 1: Can you enhance that grainy camera picture so I can make out that license plate so I can read it? Even though the license plate is just two pixels in the original recording?

Guy 2: Sure. I'll just use this wondertech to... ah, there you go. One click did it.

One thing I can't help but see all the time is when someone walks to a group of people and singles one person out to talk and the pair say something like "give us the room" and everyone else leaves. Scenes similar to this happen all the time. Even in casual settings in movies. At some point I realized it's probably because it's easier to not have a second set for a private space just for a quick conversation. I can no longer unsee this.

Weight of objects is definitely something actors don't seem to be trained in anymore. Everything looks light as a feather.

A less obvious thing is tossing a drink in somebody's face wrong. Most actors toss the drink upward from the waist, which probably sends it right up their fellow actor's nose. Sometimes you can even see a reaction when this happens. Not fun. There's a definite technique that's sort of a backhand flick of the wrist, that sends the liquid straight into their face instead of up their sinuses. It also puts your hand, the glass and the face a lot closer together, so they all fit in a much tighter shot. Not that I would know.

No one knows how to hold or use a kitchen knife properly.