Has an AFL game ever ended 50-26?
Exactly once. On September 13, 1919, Geelong beat Sydney 50-26, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 50-26 in league history.
That makes 50-26 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 51-26 has happened never and 50-27 has happened never.