Has an AFL game ever ended 90-75?
Yes. AFL has seen a final score of 90-75 4 times. It first happened on May 28, 1949, when Melbourne beat Essendon, and most recently on April 28, 2001, when Adelaide beat North Melbourne.
That makes 90-75 the 947th most common final score out of 6,607 that have ever occurred in AFL. One point away, 91-75 has happened 4 times and 90-76 has happened 5 times. At one point the score disappeared for 30 years, between 1971 and 2001.