The instruction to “Rep Rows 507 and 508 100 more times” should say “Rep Rows 543 and 544 100 more times.”
The row numbers are off beginning with Row 791. Row 791 should be Row 781, and the final row of the pattern should be Row 977, not Row 987.
Urban Aran Mitts
The highlighted area of the right mitt should be knit in seed stitch. In the original chart, all of these stitches were knit stitches.
All of the stitches in the highlighted area are knit stitches. In the original chart, some of the stitches were purls.