via the Situation Room Blog,

At 9:37 of the first period in the Toronto Maple Leafs/San Jose Sharks game, the Situation Room initiated a video review because the puck entered the Toronto net. The referee informed the Situation Room that he was in the process of blowing his whistle to stop play while the puck was under James Reimer's body in the crease. According to Rule 78.5, apparent goals shall be disallowed "when the Referee deems the play has been stopped, even if he had not physically had the opportunity to stop play by blowing his whistle." This is not a reviewable play therefore the referee's call on the ice stands - no goal San Jose.

These types of calls have to become reviewable now.

the goal of the NHL is to get the call right, but the language of the rule doesn't allow a change to be made on plays like this.