In watching Shaw's video review 13, I see that Notre Dame may have pulled a fast one by 'sort of' making it look like they would punt, but snapped the ball to a back who was close to, and directly behind, the snapper, but, technically, not with his hands in a position to receive a hand-to-hand snap. He receives the very short backward pass snap, and instantly hands it to a back who had squatted down so that he was hidden from view of the defensive line. Everybody else runs to the right, while the small back that received the handoff runs around the left end and uses his speed to score a TD.
In addition to a potential kicker at least 10 yards behind the NZ, they had a player in a direct line between the snapper and the potential kicker. This makes it NOT obvious that a kick would be attempted. Therefore, that was NOT a bona fide scrimmage kick formation, and they must have the requisite five (5) linemen numbered 50-79. They didn't.
Don't know if this got flagged, or not (kinda don't think it did). But, this is an illegal formation, for not having 5-linemen numbered 50-79. Shaw goes on to say that the Rules Committee would probably address this during the off-season. Sounds like an editorial change is coming. Right now, it just says 'no player in position to receive a hand-to-hand snap.' I suspect the rule will be edited to make it NOT a scrimmage kick formation when Team A has a player in a line between the snapper and a potential kicker 10 or more yards behind the NZ (i.e., a punt), or between the snapper and a potential holder and kicker at least 7 yards behind the NZ (i.e., a field goal attempt).
That will fix this problem. But, I'm sure coaches will keep pushing the envelope on what's legal and sportsmanlike (throughout the rules). Let's see what they come up with next.