Has an AFL game ever ended 82-45?
Exactly once. On May 23, 1908, Essendon beat Richmond 82-45, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 82-45 in league history.
That makes 82-45 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 83-45 has happened 2 times and 82-46 has happened 2 times.