Has an AFL game ever ended 37-23?
Exactly once. On May 26, 1900, Sydney beat Geelong 37-23, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 37-23 in league history.
That makes 37-23 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 38-23 has happened 1 times and 37-24 has happened 3 times.