#3 Crowd chanting and, at times, vulgarity
While WWE has never said fans can't chant what they want when they attend an event, it was at ECW shows that crowd chanting started to represent what was happening in the crowd just as much as what was happening, in the ring. If they didn't like what the talent was saying during their promos, they would tell them and weren't shy about it.
The innumerable time's female talent was referred to as ‘crack wh***s,' and fans in attendance informed the likes of Simon Diamond that ‘you suck d***,' which really pushed the envelope and suggested how the crowd wouldn't shy away from sharing their thoughts.
Corey Graves deleted his Tweet! More details HERE.
If talent ever made a mistake in the ring, the crowd would remind them by stating ‘you f***ed up!'. It was harsh and cutthroat, but fans involvement by being vocal was never more prominent than it was in ECW. Since then, fans today engage in chants that show their appreciation of a match, or lack thereof.