In the third period of Game 1, it looked like Henrik Zetterberg put his glove on a puck in the crease which would normally lead to a penalty shot, but on Saturday, it all came down to the interpretation of referee Paul Devorski.
Devorski was there at ice level, and according to the director of officiating Stephen Walkom, he's assuming that the interpretation was that Zetterberg was simply trying to bat the puck off of Chris Osgood's back.
One thing to remember though is that the crease extends upwards, so if Zetterberg did cover the puck with his glove, then a penalty shot should have been called.
It was an interpretation call, and Devorski thought that Zetterberg was trying to bat the puck, not cover it.
Home Ice Advantage in the faceoff circle
The Red Wings are a puck possession team, and they displayed that in the faceoff circle in Game 1 where they won 71% of the draws. Penguins captain Sidney Crosby only won 30% of his faceoffs, with Jordan Staal just better than that. Conversely, Henrik Zetterberg won 15-of-20 draws.
I spoke to Crosby after the game, and he believed that the Red Wings took advantage of being on home ice, where the home team player is allowed to come into the face-off second, which allows them to take advantage by timing when the puck is going to be dropped, and cheat on the play to win the draw.
Crosby believes when the series moves back to Pittsburgh that those numbers will shift in favour of the Penguins.