I know you are so disappointed Anita. After that much work, I don't know if I would ever want to touch it again. But I hope you do. If all else fails, figure out how to make a border that hides the variance. As for me, I don't have the patience to do one that complicated but enjoy so much those of you who tackle these wonderful projects.
Now, if I were determined to find out where the errors are, I would take a picture of it, print it out and then start measuring all the parts and pieces and put those measurements on your picture. That should help you find where you may want to make any seam corrections. Or JUST Don't worry about it. Finish it with the variance and be happy that it is DONE.