In overtime between the two sides with the game tied at two, it had looked as if Panther forward Ryan Lomberg had scored to end the game, but after a review, it was determined that Colin White interfered with goaltender Frederik Andersen, take a look:
There are a couple of things here: 1) this review was league initiated, and this is the first time during the playoffs that it's happened, and 2) while White does make contact with Anderson's skate, that's not much of a call at all.
It doesn't look like he stops Andersen from making the save, and we've seen throughout the year worse plays than this be considered a good goal. As well Jack Drury pushes White into Andersen and Andersen definitely slides into him as well.