The official ruling from the war room was that the defender put the puck into his own net.
That seemed sketchy to me.
Gaudreau knocked the puck towards the net with his glove. While it was in the air, the defenseman waved at it, got a small piece of it, and then accidentally backhanded it in while trying to recoil and take another swing. If I wrote the rulebook, that would not be a goal. If the defenseman had never touched it at all, it still goes in, and it doesn't count. It seems unfair to punish him for trying to make a play.
Plus, if there had been a delayed penalty on L.A. on the play, and that little touch in mid-air was deemed enough to stop play, I'd have been furious. So to say it's enough to deem the d-man responsible for the puck going in seems unfair as well. Yeah, I know it's dicey to try to use the logic of one rule and apply it to another, but that's where my head went.