Pick one.
Here's mine, and I think in the future our generation will have to answer for this, as we should:
See-through screens are ubiquitous in sci-fi movies and video games and in 99% of cases are a terrible idea, for obvious reasons.
Example, Minority Report
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- Every button, knob, or slider on anything anywhere needs to make a sound when used.
- When someone has to quickly rig up some kind of crude device, they often have time to equip it with functioning indicator lights and audio feedback.
- Laws of physics vary from scene to scene.
- Space often has the properties of warm molasses - if a spaceship's engines die, it immediately grinds to a halt. But again, this is sometimes dismissed when the plot calls for it. (Stargate: A ship, Daedalus I believe, is being pursued, when their engines cut off. It quickly comes to a halt. Different episode: Teal'c and O'Neill are in a small fighter, and it continues to drift long after its engine power cuts out.)
- The fiction:science ratio is shifting, because the perception is increasingly that science and any manner of high-brow stuff just ain't cool no more.
- Any explosion in space looks like everything's been packed full of gasoline and oxygen.