Has an AFL game ever ended 124-123?
Yes. AFL has seen a final score of 124-123 3 times. It first happened on July 12, 1941, when North Melbourne beat Fitzroy, and most recently on April 25, 1992, when Essendon beat Melbourne.
That makes 124-123 the 1599th most common final score out of 6,649 that have ever occurred in AFL. One point away, 125-123 has happened 4 times and 124-124 has happened 1 times. At one point the score disappeared for 44 years, between 1941 and 1985.