Can you tell where the extra stitch is? I sometimes have the yarn over the needle at the end of the stitches where the cable loops, mostly it happens when I'm using sock yarn and seeing the extra stitch can be difficult.
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