This is very interesting. Quilting for others, I sometimes notice a block or part of a block turned different from the other matching blocks in a top. I ALWAYS question myself if I should call the owner of the top as I don't want to look like I am picking apart the top. I really need to ask when the top is dropped off if they would like me to call them if I notice something that I am not sure about after they leave but before I start quilting it. I have been known to not see something until after the top is quilted, and in that case I never mention it to the owner.