I believe they can/do. Some of the more interactive writers, in a 'thank you message' to their readers positively encourage them to point out errors so they can be corrected.
How well and how often this happens I have no idea.
So far I have resisted pointing out to a prolific writer I otherwise enjoy that resting your rifle barrel on a solid object, such as a wall or window frame doesn't help with accuracy. It's odd because he gets the more archaic factors of sniping correct.
Bench rest shooting with a small sandbag or similar, or a hand between the solid wall, tree branch, or whatever works okay. But a solid rest really interferes with recoil and messes up the necessary predictability of the whole action when you pull the trigger.
The classic bipod rest looks solid as hell, but it moves a little, sometimes a lot.
But I enjoy the rest of his stories, it's just that one little niggle.
Gyppo (Who isn't a perfect shot, but understands the physics involved.)