The very first quilt I ever sent to a longarm quilter had a tiny cut in the backing, which she pointed out. Had I done it?? Had she?? Was it in the material all along?? I'll never know.
Here's how I fixed it: I cut out a heart shape large enough to cover the slit from the same material as the backing. I sewed that heart (face down) to a piece of used dryer sheet. Trimmed about 1/4" away from the stitching. Made a small slit in the dryer sheet and turned the heart "right side to". Pressed the heck out of that heart and then sewed it with the tiniest stitches I could over that slit in the backing. I only put my stitches through the backing material, not through the front of the quilt. I didn't have to worry about trying to turn the edges of the heart under. It looked terrific!! I told my daughter that I had put "extra love" in that quilt!
Sue