At 17:44 of the second period in the Penguins/Bruins game, the Situation Room initiated a video review to further examine a play at the Boston net. Video review determined that the puck was entering the net as the referee was blowing his whistle.
According to Rule 38.4 (ix), "The video review process shall be permitted to assist the Referees in determining the legitimacy of all potential goals (e.g. to ensure they are "good hockey goals") ... This would also include situations whereby the Referee stops play or is in the process of stopping the play because he has lost sight of the puck and it is subsequently determined by video review that the puck crosses (or has crossed) the goal line and enters the net as the culmination of a continuous play where the result was unaffected by the whistle (i.e., the timing of the whistle was irrelevant to the puck entering the net at the end of a continuous play)." Good goal Pittsburgh.