Here are some I think are missing
1. In 2006 the NBA changed to a new synthetic ball. Players hated it and before the end of the season it was cahnged back to all leather.
2. Not firing Matt Millen sooner. He basically single handedly ruined the Lions orginization.
3 1996 Art Modell takes off for higher ground in Baltimore leaving Cleveland fans teamless. (This was a good thing in my eyes)
4 Penalizing teams for TD celebrations