Has an AFL game ever ended 66-26?
Exactly once. On May 15, 1897, Fitzroy beat St Kilda 66-26, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 66-26 in league history.
That makes 66-26 the 3884th most common final score out of 6,649 that have ever occurred in AFL. One point away, 67-26 has happened 3 times and 66-27 has happened 1 times.