Has an AFL game ever ended 120-100?
It has. 120-100 has been a AFL final 2 times in 17,053 games. The first was Essendon beat Melbourne on May 13, 1944; the latest was Melbourne beat Geelong on May 19, 1945.
That makes 120-100 the 2496th most common final score out of 6,649 that have ever occurred in AFL. One point away, 121-100 has happened 4 times and 120-101 has happened 1 times.