If I spot a stitch that is wrong or looks funny on my knitting, I undo it to rectify it, even if I have to undo 1 or 2 evenings worth of knitting! It might be that the person buying it won’t notice, but it’ll bug me too much to leave it there and if I’m selling it, I want it to be right for them.
I’m one of those people in shops that checks things all over REALLY closely before I buy them! 