At 0:44 of the first period in the Bruins/Red Wings game, Detroit requested a Coach's Challenge to review whether Boston was off-side prior to Frank Vatrano's goal.
After reviewing all available replays and consulting with the Linesman, NHL Hockey Operations staff confirmed that Boston's Brad Marchand had possession and control of the puck as he entered the attacking zone prior to the goal. According to Rule 83.1, "a player actually controlling the puck who shall cross the line ahead of the puck shall not be considered 'off-side,' provided he had possession and control of the puck prior to his skates crossing the blue line."
Therefore the original call stands - good goal Boston Bruins.
Since the Coach's Challenge did not result in the original call being overturned, the Detroit Red Wings forfeit their time-out.