On day 3 of FUE procedure. Some transplanted hair shafts are stuck to the scalp. Are the grafts still viable? (Photo)

If the grafts look like it is falling out of your scalp, then it would be an issue.  Contact your doctor with your concerns.

I would say that it looks fine from what I can tell from the picture. It is not uncommon to have the hairs themselves attached to the skin or in a scab. As long as the meaty part of the graft is implanted in the scalp, it is good. 

If that is a graft sitting on your scalp whcih is not clear from the picture, I would expect that it is a lost graft. This is no uncommon.