I just realized that the Vikings could have FORCED the officials to review the infraction.
The rule currently on the books is that all scoring plays are reviewed. THAT WAS A SCORING PLAY!
The sack resulted in a 2 point score. They should have demanded that it be reviewed because it was indeed a scoring play.
I think it was reviewed because it was a scoring play. I don't think the rules allow for the after-the-fact calling of a facemask penalty. I could be wrong.