I couldn't find any errata for this pattern http://www.ellarae.com.au/Corrections/Book19.aspx
but there are certainly errors
Disregard the number of shaping rows. There are mistakes for almost all sizes in that number. (After all, why should the number of rows be different for the smallest and the next size when the number of increases is the same?)
Increase on the rows indicated in post 3 and you'll be fine.
It's a darling sweater and will work out well, I'm sure.