Has an AFL game ever ended 57-12?
Exactly once. On August 4, 1900, Geelong beat Fitzroy 57-12, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 57-12 in league history.
That makes 57-12 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 58-12 has happened never and 57-13 has happened never.