My take (for what it's worth) after carefully looking at the overhead shot as well as the regular one in slow motion several times:
Noesen cuts across and the overhead shot shows that his left skate contacts Daws right skate just before it completely exits the crease. Daws right skate could have even been partially out, and the rest of him is completely clear of the crease. Doesn't seem to impact Daws much at all at that point.
Daws glides completely out of the crease while Noesen is making a legit, hard attempt to cut away from him, but at that point Noesen is nudged by the defenseman into Daws.
This season the league stated that calls wouldn't be overturned unless the evidence was overwhelming. Given that stance, I think the fact that the initial point of contact was with Daws skate while it was still "in the crease" gave Toronto an excuse to not overturn the call on the ice. When I say "excuse" I don't mean I think the league wanted to screw the Canes or benefit the Devils; I think they wanted to support the refs and their own earlier proclamation discouraging challenges.
I think the interference call was a bad one to begin with, just not one that Toronto was necessarily going to overrule. I suspect that if the call on the ice had been "good goal", and Jersey challenged, Toronto would have opted not to overturn that call, either.