Has an AFL game ever ended 24-5?
Exactly once. On June 24, 1899, Carlton beat Sydney 24-5, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 24-5 in league history.
That makes 24-5 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 25-5 has happened never and 24-6 has happened never.