Good and well balanced thread.
The spot was terrible, no doubt. Maybe they just thought they would pick it up on third down.
I thought there was an obvious missed hold on the first Leidner TD run. The hands to the face call kind of evens that out.
When they call delay of game, they don't call it when the clock hits zero, they call it after the ref looking at the clock looks down after it hits zero to see if it is snapped. It happens quite often.
As for holding, as long as the blockers arms are inside, you are allowed to "hold" the defensive player. It is when they get outside and they continue to hold the player that holding should be called. It is why defensive players are coached to keep the offensive players hands off them. It makes it look like holding is happening all the time when it is not the case. They also will call holding quite often if the defender is thrown to the ground, even with the hands inside. Strength is obviously a key to the technique, on both sides of the line.