Has an AFL game ever ended 34-18?
Exactly once. On May 12, 1900, Melbourne beat Essendon 34-18, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 34-18 in league history.
That makes 34-18 the 3884th most common final score out of 6,649 that have ever occurred in AFL. One point away, 35-18 has happened 2 times and 34-19 has happened never.