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Why would a creator make a character say something incorrect and not make others react to it?
^Because the author may not be aware that the character's statement is factually incorrect, due to Critical Research Failure.
^^@OP: Yes, that's covered by Critical Research Failure. If the other characters decide not to correct them, it could be because they realize he/she's Too Dumb to Fool. Or they might feel that there's no use trying and simply walk away.
This would be covered by the In Universe Factoid Failure
draft that's currently in Trope Launch Pad.
^^ OP said the creator is aware of the mistake but keeps it in for artistic reasons.
^ The draft seems to steer towards lampshading the incorrectness which OP is not looking for.
Edited by eroock
Example?
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
The creator being aware of the mistake and keeping it in for artistic reasons is literally the original definition of Artistic License. TV Tropes just defines it a little more broadly; in order to cut down on negativity and justifying edits, we just pretend all errors are "Artistic License", even if they were genuine mistakes on the author's part.
Critical Research Failure is a holdover from the old, more negative, days of the site, and it just applies to mistakes so huge that anyone with cursory knowledge of the subject recognizes they're wrong (thus signaling that the author did zero research, hence the title). It's a judgement call whether any given mistake is huge enough to qualify as CRF, so that's why it's a YMMV trope even though Artistic License is an regular, objective trope.
ANYWAY, I guess the big question is, how do we even know it's the character making the mistake and not the author, if the author doesn't bother to correct the character in-story, whether through the other characters or through narration? By Word of God?
^ by being Instantly Proven Wrong?
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
I was wondering if there is a separate trope from Artistic Licence when the work contains an error because the character in question is just plain wrong and others either do not know or think it is too trivial too correct them rather than the author getting it wrong.