Michael Cammalleri's Penalty Shot Goal against the Boston Bruins

The more I watch this video the more I come to the conclusion that the penalty that led to the Cammalleri penalty shot was very weak and a brutal call by the official.

Edit: in looking back at this play that led to the penalty shot, I must conclude that this was a bad call by the NHL on ice officials, their incompetence cost the Boston Bruins the game and points in the standings, there is no way that the Montreal Canadians deserved a penalty shot on that play, maybe hooking but that was even stretch.