Has an AFL game ever ended 57-30?
Exactly once. On August 11, 1951, Fitzroy beat Footscray 57-30, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 57-30 in league history.
That makes 57-30 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 58-30 has happened never and 57-31 has happened 4 times.