Has an AFL game ever ended 73-55?
It has. 73-55 has been a AFL final 4 times in 16,622 games. The first was Carlton beat Geelong on May 25, 1929; the latest was St Kilda beat Carlton on July 2, 2020.
That makes 73-55 the 947th most common final score out of 6,607 that have ever occurred in AFL. One point away, 74-55 has happened 6 times and 73-56 has happened 2 times. At one point the score disappeared for 39 years, between 1962 and 2001.