It seems like I can't count. I make a LOT of errors while knitting this pattern. For that black and white sock, I reknit so many times, I'm convinced I could have made a complete second sock in the time I spent fixing errors. Not big errors, just little ones where I find I'm one or two stitches off.
Interestingly, I'm making another pair just like this one! I'm still on the foot repeats.