Has an AFL game ever ended 150-75?
Exactly once. On July 25, 1992, Melbourne beat Richmond 150-75, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 150-75 in league history.
That makes 150-75 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 151-75 has happened 2 times and 150-76 has happened never.