I am sorry to hear about that. Most of the time, others don't see them. I have done it to alot of quilts before and really, taking pictures of your quilt after the top is done is such a great idea. You don't really see it when you are looking right at the quilt.
When I first started making quilts when I was in high school, I used to accidentally have atleast two fabrics upside down. Nobody ever noticed. They were just happy to have hand made quilts.