I don't remember any specific plays that were blatant penalties by the Wings that got overlooked. If you have the puck and are controlling play more, the less likely you are to commit infractions. Toews should know this on a puck possession team.
This was just one team being far better than the other. The refs influence outcomes all too often in the NHL these days, but it's silly to claim a little physical play prevented Chicago from winning. Toews doesn't care that Shaw skates around like an idiot though nearly every shift?
CBC was replaying the "should've been called" highlights several times, and Zetterberg was rough on Toews, but nothing that deserves a playoff penalty (probably not even a regualr season call). It's a part of the game, Holmstrom made a career off taking far worse clobberings.