(1) When good guys refuse to use guns. Most egregious in Clear and Present Danger where Harrison Ford, portraying a seasoned CIA agent, never touches a gun for the entire movie!
(2) When someone cocks the gun to appear more threatening, as if being able to pull the trigger 1/10th of a second faster makes a difference.
(3) When characters on the run are listening to a radio/TV report about the police searching for them, where the authorities think they are, where the roadblocks are placed, and the character switches off the TV/radio RIGHT IN THE MIDDLE OF THE REPORT – don’t you think it’s wise to know what the other side is doing???
(4) Any time two characters have to explain something solely for the benefit of the audience, like what a maharaja is, or the rules regarding FBI wiretaps, etc. Yes, it’s important to explain such things for the 2% of people who don’t already know, but when you have Tommy Lee Jones in Volcano, playing a senior vulcanologist, have to ask his co-worker what MAGMA is, you need to hire a better screenwriter.
(On the other hand, my favorite subversion of this trope is in The Day Reagan Was Shot, when Reagan needs to have the purpose of the Nuclear Football explained to him. You’d think a President would already know that – on the other hand, it’s Reagan. Richard Crenna even plays it off like a temporary pre-Alzheimer’s brainfart.)
(5) Computers. Dear God, all movie computers come from a different planet. Featuring a flashy, fancy GUI with beeps and boops and full-color 3-D graphics…and yet, nobody ever uses a mouse.
(6) Whatever happened to casual nudity?
(7) Once, just once, I’d like to see a dog in danger actually die. I’m looking at you, Independence Day.