Has an AFL game ever ended 84-31?
Exactly once. On July 27, 1946, Footscray beat Sydney 84-31, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 84-31 in league history.
That makes 84-31 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 85-31 has happened never and 84-32 has happened never.