Has an AFL game ever ended 120-72?
Exactly once. On May 10, 1947, Melbourne beat Richmond 120-72, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 120-72 in league history.
That makes 120-72 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 121-72 has happened 3 times and 120-73 has happened 1 times.