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The original was posted on /r/movies by /u/AporiaParadox on 2023-08-02 15:07:27+00:00.
Pretty much any movie or TV show written by older people that shows young people talking in slang will use out of date slang or made-up slang because the writers are old and aren't as aware of how young people of that time actually talk or behave, so they either rely on slang they remember from their own youth and give off "how do you do fellow kids?" energy, use internet buzzwords they've read in the wrong context, or just make stuff up and hope nobody will notice.
Another common thing that up until recently was portrayed anachronistically is videogames. Games in movies would often use Pac-Man sound effects, still use the concept of "levels" to indicate progression, care about "high scores" and button mashing while wildly flailing the controller is a valid strategy, because that's what the writers remembered from the arcade machines of their youth. It's gotten better lately due to newer creators being of a generation that not only played games when they were young, but continue to play them.
So what other things do creators consistently get wrong due to applying the experiences of their youth to the modern day or just imitating what older movies did without doing any additional research?