Some Kindle Unlimited stories set this one off for me today. One story had a very basic error that a quick wiki search should have cleared up.
They confused NASA with the NSA. Although they were consistent in constantly referencing the NSA as NASA instead.
Note to self: When writing/editing stories involving "alphabet soup agencies" double check to ensure you use the correct set of letters.
The latest one was somebody failing to understand how IQ measurements attempt to be scaled. (And there are many variations within that) However, the big takeaway is the "goal" of the IQ scales is to set IQ100 as dead center "normal" ie "average" intelligence(although in some cases, it might be a mean instead).
So when you include dialogue that proclaims "The average IQ of a person on Earth was significantly below 100." (With Earth being the only place with humans, and to be clear, they were using the "human specific" scale) You immediately have a problem. By definition, you cannot have a majority of the population be below average at anything.
Of course, we could also get into the often arbitrary, capricious, and culturally biased nature of most IQ tests and say if everyone was tested by that specific methodology, that outcome would potentially result... Except we go back to the matter of 100 being the (moving) baseline they compare against. So if that outcome happened, they would adjust the scoring methodology to correct it back.