In the third period when Edmonton was still within striking distance of tying the game, Connor McDavid was in on the forecheck and appeared to go down hard in the corner. Surprisingly McDavid was given the penalty, and Rogers Place erupted in chants against the refs. And of course shortly after, the Hawks scored on the powerplay to put the game away.
On his way out of the penalty box, McDavud was clearly laying into the referees about what seemed to be a controversial call. The referee rightly didn't give McDavid much time for the complaint, and it was clear sign of frustration for the Oilers captain.