| I think that you probably made the same mistake a lot of folks make and you mistook a loop between a stitch for an actual stitch and knitted it. It's easy to do, especially if you're using a novelty yarn. |
Probably. I'm using a normal worsted weight yarn now, and taking my time and actually counting the stitches to make sure I don't magically add any.

| Your Dr Who scarf is in my knitting bag, wondering what it did to make me ignore it the way I have been. |

I'm sure the holidays kept you quite busy. I have a whole new appreciation for what it takes to make something like that. I am nowhere near ready to attempt multiple colors. I can't even get a simple single color scarf to come out right yet. I'm trying a 2x2 ribbed scarf and have already frogged it three times because I wasn't happy with the stitches.