Mistakes are what make a quilt custom! I would want to know but I always recommend taking a picture of a top before you quilt it you would be surprised as the difference of what you can see in the picture, I always take several while I'm planning the layout it's amazing. I have a deeper question....what if it's the quilting that makes that ruins the quilt?? Do you say anything especially when you know the quilter and you know they consider themselves a top notch professional? You know they produce beautiful work so image the shock when they leave 10inch un quilted which makes all the blocks puff out and look like a wrinkled mess, different colored bobbin on part by mistake but left and uneven quilting all over? Represented a group gift to another quilter....I'm still in shock from it and we said nothing because no one could find the words.