About an hour ago, I counted the number of Clue 4 stitches remaining to be picked up on my Mystery Stole and realized that I had reached (technically) row 159 of the wing. I was shocked; until that moment, I had THOUGHT I was on row 149.
It's not an egregious error, but I'll have to fudge the rest of the rows so that the feathers lengthen gradually instead of looking long-long-stubby. On the bright side, I'm 10 rows closer to being done! Semi-huzzah!