If you just want to secure the dropped stitch, I'll tell you what I've done and it works great. Pull the loop through to the wrong side. Then take a tapestry needle with the same yarn, or a crochet hook, and pull yarn through the loop of the stitch above the dropped stitch, through the dropped one and through the stitch below it. Tie a little knot and weave in the ends.
If you want to correct it, you could try to use a crochet hook to bring it back up as in Amy's video.