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I think it's always a case of if you know a lot about the subject, it can bug you.
For instance, most mistakes about space bother me. Particularly ones where people freeze to death when they go out into a vacuum because it's so cold.
Which is true technically, but it's also a vacuum, so the only way to transfer heat from a body is by radiation. So basically you'd have to be dead for a while (not generating any more heat internally) for you to eventually freeze.
Mistakes with guns bother me. The early Shadow novels are terrible about this. Including one where a gang is described as carrying revolvers with one empty chamber, so if they dropped them, it wouldn't go off (which people do, though there is some debate as to whether or not that's necessary). But then he describes them as having to pull the trigger twice to get it to fire because of it, which if of course, is not how revolvers work. The chamber under the hammer when you pull the trigger is not fired, it's rotated as the hammer goes back, and the hammer then falls on the next one (which would be loaded).
And then recently I read a book aimed at providing technical info about crime scene handling written by a former detective, because she hates crime scene mistakes in books (like fingerprint terminology). But she made a couple mistakes about guns, including a mistaken correction of Agatha Christie (who sometimes referred to "automatic revolvers", which actually existed in England while she wrote. Not well known to Americans 60 years later, but common enough at the time, even making an appearance in The Maltese Falcon).
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