Has an AFL game ever ended 70-42?
Exactly once. On May 23, 1925, Melbourne beat Footscray 70-42, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 70-42 in league history.
That makes 70-42 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 71-42 has happened 4 times and 70-43 has happened 2 times.