Has an AFL game ever ended 121-101?
It has. 121-101 has been a AFL final 3 times in 16,622 games. The first was Collingwood beat Carlton on August 13, 1938; the latest was Richmond beat Melbourne on June 8, 1985.
That makes 121-101 the 1534th most common final score out of 6,607 that have ever occurred in AFL. One point away, 122-101 has happened 2 times and 121-102 has happened 3 times. At one point the score disappeared for 33 years, between 1938 and 1971.