On p. 2, the instructions for working the heel flap should be corrected to state that the first stitch of each purl row should be slipped.

The instructions should read something like this:
Heel Flap
Beginning on a right side row follow the heel-stitch pattern for 20 rows, total.

Heel Stitch

1. right-side rows: (sl 1, K1) repeat between () to end, turn;
2. wrong-side rows: sl the first stitch and p all remaining stitches to end, turn.

You should now be ready to continue, on the right side, to turn the heel.