Has an AFL game ever ended 129-56?
Exactly once. On June 15, 1959, Melbourne beat Essendon 129-56, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 129-56 in league history.
That makes 129-56 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 130-56 has happened never and 129-57 has happened never.