Nothing I make/do is without a "boo boo"...and I do mean nothing. Whether it be cooking, sewing, talking, cleaning, doing my office job, or raising my children - they all contain errors.
Would I want to know about each and every one? mmmm probably not or someone would be telling me about stuff all day.
Someone asked me if I make stuff to sell and my reply is always, "I only make stuff for people I really like and I don't like that many people.". So if I have taken the time to make something for someone, you can bet your booties there will be an error in it. Will I correct it? Probably not. Do I want to know about it? It won't matter because it was made with love and nothing will change it so the error will stay.
I can't imagine not wanting to give your gift to someone because it has an error in it, glaring or not. I'm glad I'm not that hard on myself.
As far as telling someone else...only if they asked and wanted the cold hard truth...otherwise, nope.