I think technical errors made in something which is your specialty are always off-putting. If, as a writer, you are a) aware of them and b) able to put them right without damaging your story, then of course you should. But what should you do if you think it doesn't invalidate your story (think of the discussions in Misery about story, and the important factor being whether it works or not)?
I wrote a story in which a child (10 or so) is assaulted - she fears she will be killed, but blacks out and is rescued. The incident is important for a number of reasons, but her character is established as strong-minded and she is able to get past it. The story works really well for most of the people who read it, but I have a friend who is (among other things) a trauma counsellor, and she said it killed the story for her because, from her experience, she knew the child couldn't simply recover in the way I'd written. I'm quite sure she's right, but I'm equally sure that the story works perfectly well for readers who aren't counsellors, and if I have my character undergoing years of trauma counselling, the rest of the story won't work. So I'm not going to rework anything, and I'm afraid my friend will just have to not think very much of that story.
I'm not an expert on cars or firearms or baseball or millions of other stuff, so I have nothing to nitpick over in SK's work, in any case!