Has an AFL game ever ended 84-48?
It has. 84-48 has been a AFL final 4 times in 16,622 games. The first was Fitzroy beat Hawthorn on August 16, 1952; the latest was Adelaide beat GWS on September 7, 2017.
That makes 84-48 the 947th most common final score out of 6,607 that have ever occurred in AFL. One point away, 85-48 has happened 6 times and 84-49 has happened 7 times. At one point the score disappeared for 62 years, between 1953 and 2015.