Though it’s rarely the case, here the delicate lace and cable stitches are fully reversible, making the shawl collar look exactly the same on the front and back sides of the fabric, so there is no awkward wrong side to hide.
Cardigan is knit in pieces from the hem up. Lace panels are knit with each front, and are worked as an applied border from the top of the shoulder to the back of the neck, after back and front shoulders are joined. The lace pattern is mirrored (chiral) on right and left front panels, except that all lace-related decreases are k2tog for simplicity.
There is errata for this pattern. It's here: Chokecherry Days.