85.3 Puck Out of Sight - Should a scramble take place or a player accidentally fall on the puck and the puck be out of sight of the Referee, he shall immediately blow his whistle and stop the play. The puck shall then be faced-off at the nearest face-off spot in the zone where the play was stopped unless otherwise provided for in the rules.
Unless you are arguing that the refs saw the puck go into Mike Smith's pants, in which case they would have signaled the goal they should have blown the whistle. Combine that with the this rule, it should be no excuse for the puck being even allowed to cross the blue line.
31.2 Disputes - The Referees shall have general supervision of the game and shall have full control of all game officials and players during the game, including stoppages; and in case of any dispute, their decision shall be final.
As there is a human factor involved in blowing the whistle to stop play, the Referee may deem the play to be stopped slightly prior to the whistle actually being blown. The fact that the puck may come loose or cross the goal line prior to the sound of the whistle has no bearing if the Referee has ruled that the play had been stopped prior to this happening.
Both rules from NHL.com
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