Here I am fixing a mistake no one would have ever noticed or known about other than me. You can see in the first pick the wrong side has some knit stitches that should have been purled. You can't even really tell on the right side since the mistaken purl stitches fit right in with the garter stitch. However, it bugged me and fixing it took 10 mins tops. I just popped out 2 stitches and laddered down to the mistake. Taking my crochet hook I just pulled up 2 loops then flipped the work and pulled up 2 more using the next ladder. Repeat until you are back to the top, and voila! Good as new.