You can use your crochet hook to work the dropped stitch up as many rows as you can without pulling it too tightly. Then on the wrong side, pull a piece of matching yarn through the stitch and work the ends in to secure it. I recently did this on a pair of socks, worked like a charm.
Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper