Has an AFL game ever ended 84-22?
Exactly once. On August 2, 1902, Essendon beat St Kilda 84-22, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 84-22 in league history.
That makes 84-22 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 85-22 has happened never and 84-23 has happened never.