Has an AFL game ever ended 56-24?
Exactly once. On July 25, 1903, Fitzroy beat Carlton 56-24, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 56-24 in league history.
That makes 56-24 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 57-24 has happened 1 times and 56-25 has happened 3 times.