Has an AFL game ever ended 77-49?
Exactly once. On July 20, 1935, Melbourne beat Geelong 77-49, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 77-49 in league history.
That makes 77-49 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 78-49 has happened 4 times and 77-50 has happened 4 times.