Has an AFL game ever ended 84-68?
Exactly once. On June 28, 1958, Melbourne beat Carlton 84-68, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 84-68 in league history.
That makes 84-68 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 85-68 has happened 6 times and 84-69 has happened 6 times.