I just got my son a down bag for his scouts campout.
when I picked him up he went red in the face and told me he ripped the bag
he said every morning there were feathers in the tent.
when we got home found out it was just the natural feather loss of a new bag.
If its a few feather here and there - I wouldn't worry too much - both my down jackets loose several feathers every time I wear them.
I figure with a down - you can lose what looks like lots of insulation - but won't lose much loft for a long time