Anglesmith
Setting up the play?
I think that you can't hit goalies as hard as you want to. But if a goalie blocked an opponent from the puck as he tries to skate by, the goalies need to be called for interference. I seemingly remember Belfour getting a penalty for hitting someone behind the net, but goalies have gotten too much protection.
Goalies (including Mike Smith a few times this year) can definitely get called for interference for getting in the way when they don't have the puck. But when they do have the puck it's a bit of a loophole. They have all the same protections and can intentionally put their body in the way.
This is a natural human reaction by Smith being hit by Kane (about 6:35 if it doesn't skip to where it needs to be). Notice how he doesn't jump up after contact? Smith embellished.
And guess what, I bet you there were hordes of fans claiming it was a dive.
This is a play where he got spun by glancing contact. Edler's force was right through him. It makes sense that they look very different.
As you can see, Smith doesn't just flop whenever he feels contact. If a player drives through a goalie, though, he's going down and it's going to look spectacular.