I get tons of single strand knots when I where my hair in a puff. Since the puff is my favorite style I'm constantly battling them. I usually end up having to cut 1/2 to 1 inch off to get rid of them. Or the knot will be 3-4 inches up the strand and I just leave it.
Here is my pic:
The knots are so tiny and you wouldn't know they were there unless you ran your fingers down the strands. Sometimes I will have two knots in one strand.