Has an AFL game ever ended 91-68?
It has. 91-68 has been a AFL final 4 times in 16,622 games. The first was Carlton beat Fitzroy on May 30, 1942; the latest was GWS beat North Melbourne on June 16, 2019.
That makes 91-68 the 947th most common final score out of 6,607 that have ever occurred in AFL. One point away, 92-68 has happened 2 times and 91-69 has happened 7 times. At one point the score disappeared for 53 years, between 1951 and 2004.