That is not hard to fix on the very next row. I just tried it. When you get to the error knock the 2 stitches that are wrong off the left hand needle and pull the yarn that makes it a completed stitch out and rework them correctly with the little piece of yarn that goes with them. Have the strand of yarn behind them, slip the first stitch knit wise, knit the next one with the strand behind it (you can just use a crochet hook to pull the strand through the stitch or use the knitting needle) and then pass the slipped st over. Then slip the result back to the left hand needle tip and you are ready to do what you need to do at that point on that row.