Has an AFL game ever ended 151-50?
Exactly once. On August 7, 1976, Carlton beat St Kilda 151-50, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 151-50 in league history.
That makes 151-50 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 152-50 has happened 1 times and 151-51 has happened never.