Has an AFL game ever ended 71-50?
Yes. AFL has seen a final score of 71-50 4 times. It first happened on August 22, 1914, when Carlton beat Essendon, and most recently on July 7, 1979, when Essendon beat Footscray.
That makes 71-50 the 947th most common final score out of 6,607 that have ever occurred in AFL. One point away, 72-50 has happened 4 times and 71-51 has happened 4 times. At one point the score disappeared for 29 years, between 1914 and 1943.