Has an AFL game ever ended 120-108?
Exactly once. On June 28, 2002, Essendon beat Melbourne 120-108, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 120-108 in league history.
That makes 120-108 the 3884th most common final score out of 6,649 that have ever occurred in AFL. One point away, 121-108 has happened never and 120-109 has happened 3 times.