Dress making - the adventure continues!

So, after I'd pinned the yoke pieces together for my nieces dress and sewn them, and then the dress pieces together and sewn them, I pinned the yoke in place ready to sew:

I was feeling pleased with myself once I'd sewn all the pieces in, but as I went to turn the pieces out to press the seams, I noticed I'd sewn right side to wrong side.  :(  Why does unpicking take so much longer that sewing!