Has an AFL game ever ended 123-120?
Exactly once. On June 27, 1992, Richmond beat Carlton 123-120, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 123-120 in league history.
That makes 123-120 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 124-120 has happened 2 times and 123-121 has happened 1 times.