For three quarters in the pouring rain, Mizzou controlled the game defensively. The slipped in for a touchdown late in the first half, but for the most part, Nebraska played well on defense too. Then the fourth quarter came.
I think that what happened in the fourth quarter is best explained by the following excerpt from South Park.
I believe the official count was that the Huskers scored 500 points in the first five minutes of the fourth quarter.