When you live Boston series for a few days in a row, you really get the sense of living in a completely different world from the opposing fanbase. Besides the difference in player drafting and development philosophies, it's the complete divergence on what is hockey and what is not.
To the Bruins, there should be no penalties. Their players know the rules and that should be enough. Let them be the ones to interpret how things can be taken -- given the game situation. The Canadiens believe quite firmly in penalties and are happy to derive strategies with the fact-of-NHL-life at the centre.