How do you pick up a dropped stitch quickly?
In stockinette stitch: To rescue a dropped stitch from the knit side of stockinette stitch (if the purl side is facing, turn it around), reach through the dropped stitch with a crochet hook and pick up the bottommost strand in the ladder. Then, pull the strand through the stitch toward you to form a new stitch.
How do you pick up multiple dropped stitches?
Crochet hooks are ideal for picking up dropped stitches. The down side is, of course, that you need to have a crochet hook on hand, and it needs to be approximately the same size as your knitting needles, or a bit smaller. Just make sure that you pick up the right stitches as you work.