Leafs fan here so maybe a bit of bias, but I don't think that should have been a slashing penalty. The guy reached in with 1 hand on his stick and the wind looked like it could have blown it out of his hand. The other side of the coin is that isn't an easy thing for the ref to see.
I was wondering the same thing on your second question. I would tend to think it is part of the glass, same as the glass partitions. Tbay should play until the whistle.
