Has an AFL game ever ended 121-112?
Exactly once. On June 2, 2000, Adelaide beat Richmond 121-112, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 121-112 in league history.
That makes 121-112 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 122-112 has happened 2 times and 121-113 has happened 2 times.