Has an AFL game ever ended 54-23?
Exactly once. On August 10, 1901, Geelong beat Carlton 54-23, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 54-23 in league history.
That makes 54-23 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 55-23 has happened never and 54-24 has happened never.