Has an AFL game ever ended 131-121?
Exactly once. On May 22, 1993, Hawthorn beat Richmond 131-121, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 131-121 in league history.
That makes 131-121 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 132-121 has happened never and 131-122 has happened 1 times.