Has an AFL game ever ended 90-71?
Yes. AFL has seen a final score of 90-71 4 times. It first happened on September 11, 1926, when St Kilda beat North Melbourne, and most recently on April 30, 2011, when Adelaide beat St Kilda.
That makes 90-71 the 947th most common final score out of 6,607 that have ever occurred in AFL. One point away, 91-71 has happened 6 times and 90-72 has happened 5 times. At one point the score disappeared for 51 years, between 1926 and 1977.