My take...
Boston first goal was offside and here is why... the Boston player had control of the puck when he crossed the blue line with the puck and the other Boston player was offside. Had said Boston player banked the puck off the boards and then failed to touch it, then yes not offside.
However the Boston player had total control of the puck and was merely stick handling. Let’s get real here... a players stick is not always touching his stick when stick handling.
That goal and subsequent power play set the tone of the game.
Bottom line Refs 1 Canucks 0