Unfortunately, the errors below made it into the book version of this pattern. Any PDF you have purchased from me has been fully corrected and significantly clarified.

Page 140
Clarify yarn description as follows:

for Devil hat: 120 yards from recommended yarn list
for Snow Devil 200 yards from yarn list
for contrast horns, reserve 9 yards per horn

Yarns: Karabella Aurora bulky merino, Muench Goa cotton/microfiber blend, Muench Aspen merino/microfiber blend, KnitPicks Sierra, or any bulky weight yarn which knits to gauge.

Page 123
Gussets

Note: Gussets are symmetrical for the small size, however, medium and large require separate directions each side.
Excluding widow’s peak and sts on hold, count the number of rows you have knit along the side edge of the piece and place a marker at the midpoint of the rows. Mark this center st on both edges of crown.

Right Gusset

Prep row: With RS facing and picking up ONE ST FOR EVERY TWO ROWS, pick up and knit 3 sts before the center marker, drop marker, pick up 3 more sts. Pick up will be most attractive if you pick up in the knot, not the open stitch. Equal number of rows rem on each side of the sts picked up.—6 sts

Page 124
Right gusset, Large only

Add
Row 11: Turn, p19, sl last st as if to purl, pick up and p1 st, psso—20 sts.

Note, correct to say: The SEAM is created by …

All sizes
Correct row numbers for large size now that row 11 has been added:

All Sizes:
Row 8 (8, 12): Turn, k14 (17, 19), sl last st as if to knit, pick up and k1, psso—15 (18, 20) sts.
Row 9 (9, 13): Turn, p14 (17, 19); sl last st as if to purl, pick up and p1, psso—15 (18, 20) sts.
Repeat rows 8-9 (8-9, 12-13) until… (continue as given in book)

Left gusset, prep row should read
Prep rows: Work rows 1-4 as for right gusset.

Left gusset, Large only

Add
Row 11: Turn, p19, sl last st as if to purl, pick up and p1 st, psso—20 sts.

Nape
The edge sts are handled differently on the Mohawk vs. Snow Devil and Devil hat. In section headed with “All sizes” just before “Nape”…

Insert “For the Snow Devil and Devil hat”, before “place sts on holder”… the rest is ok to the end of paragraph.
Then add:
For Mohawk: place all sts from hold onto needle together.

Page 142:
Left horn, end of paragraph should say slip back to RIGHT needle

Page 144:
Last line before Left flap should read
Rows 16-27: Rep rows 12-15 three times—55 (57, 61 sts)
Add:
Rows 28-30: Rep rows 12-14 once
Row 31: Rep row 1—55 (57, 61) sts

Left flap
Row 3: k1, p1, k to marker and drop marker, RLI, k4, k2 tog, p1, k1—21 sts
Row 5: Rep row 1—19 sts
Row 6: Rep row 2—18 sts

Page 145
Right flap
Row 3: k1, p1, SSK, k4, LLI, k11, p1, k1—21 sts