Has an AFL game ever ended 71-41?
Exactly once. On July 10, 2015, Richmond beat Carlton 71-41, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 71-41 in league history.
That makes 71-41 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 72-41 has happened 3 times and 71-42 has happened 4 times.