Thanks for asking about the ZigZag Trellis scarf. Row 22 (in the second section) and all wrong side rows, should be purled. I guess I was assuming that would be obvious, but we all know what happens when we assume. Let me know how your scarf turns out.
P.S. I'll post tomorrow with some pictures of a completed Chevron top and a new project. Yes, yes, I know. :)