Explanation:
Video review supported the call on the ice that Montreal's Brendan Gallagher interfered with Tampa Bay's Maxime Lagace, preventing him from playing his position in the crease. The decision was made in accordance of Rule 69.7, which states in part, "In the event that a goalkeeper has been pushed into the net together with the puck by an attacking player after making a stop, the goal will be disallowed."
Penalty: 2:00 minor penalty: Delay of Game - Unsuccessful Challenge