Can’t believe no one has mentioned this yet but my big one is physics in microgravity. There are some that do it well (like obv Apollo 13 given how they filmed it, and The Expanse is usually pretty good about it too) and plenty that it doesn’t really matter but there’s a bunch of movies and tv shows that hang major plot points on poorly thought out physics. The worst offender imo was ironically the movie Gravity, where a major character dies because apparently when two people are tethered to each other in zero-g and the line goes taut they don’t just bounce back towards each other, oh no, because there’s an extra special force that keeps pulling on the futher person so he has to make some dramatic self sacrifice. I was so sad because that movie looked really amazing from a cinematography perspective and obviously a lot of people loved it regardless but i just couldn’t get past how dumb that and a few other scenes were.

The scam part comes when you are forced to fight tooth and nail to get money from them even when you are clearly covered