user99: This question What happens to Mr 3? contains a minor factual inaccuracy (Mr. 3's ability is wax, not clay). It doesn't affect the core of the question though. The answer points it out, and then answers the core question. 
From an etiquette perspective, I have two questions:

Is it better to edit the question to remove the inaccuracy, rather than pointing it out in the answer?
What should a third user do in this case? Edit both the question and answer, or just leave it as it is?

Note: I use this question and answer only as an example to illustrate the point. Not nitpicking either of the users. 

user27: The question should remain intact. Remember that it was the OP's intention, and others may have the same misconception and same inaccuracy. 
Pointing it out in the answer also gives valuable info even for those who didn't ask for it. 

99: <p>This question <a href="https://anime.stackexchange.com/q/5866/99">What happens to Mr 3?</a> contains a minor factual inaccuracy (Mr. 3's ability is wax, not clay). It doesn't affect the core of the question though. The <a href="https://anime.stackexchange.com/a/5867/99">answer</a> points it out, and then answers the core question. </p>

<p>From an etiquette perspective, I have two questions:</p>

<ul>
<li>Is it better to edit the question to remove the inaccuracy, rather than pointing it out in the answer?</li>
<li>What should a third user do in this case? Edit both the question and answer, or just leave it as it is?</li>
</ul>

<p><strong>Note:</strong> I use this question and answer only as an example to illustrate the point. Not nitpicking either of the users. </p>
 27: <p>The question should remain intact. Remember that it was the OP's intention, and others may have the same misconception and same inaccuracy. </p>

<p>Pointing it out in the answer also gives valuable info even for those who didn't ask for it. </p>
