I did fix the cuff error yesterday. I also cut open the sleeves and neck so I could try the sweater on. I almost cut through the back of the sweater. Whoops. Luckily "almost" doesn't count.
Here's the neck:
The sleeve openings made me nervous, some loose ends. After cutting I went back and sewed around the holes again.
There's a bit more at the KAL blog. I'm not sure about the drop shoulders.