Has an AFL game ever ended 90-78?
It has. 90-78 has been a AFL final 3 times in 16,622 games. The first was Melbourne beat Sydney on June 23, 1928; the latest was St Kilda beat Geelong on August 22, 1964.
That makes 90-78 the 1534th most common final score out of 6,607 that have ever occurred in AFL. One point away, 91-78 has happened 6 times and 90-79 has happened 7 times. At one point the score disappeared for 32 years, between 1932 and 1964.