Has an AFL game ever ended 27-26?
Exactly once. On September 16, 1899, Fitzroy beat Sydney 27-26, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 27-26 in league history.
That makes 27-26 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 28-26 has happened never and 27-27 has happened never.