Has an AFL game ever ended 79-28?
Exactly once. On May 10, 1919, Sydney beat Melbourne 79-28, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 79-28 in league history.
That makes 79-28 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 80-28 has happened 1 times and 79-29 has happened 1 times.