The letter DID appear in Philadelphia and, I believe, that is the show that Clay announced that he had finally reached puberty and became a man. Then in Newark he complained that someone had contacted his mom to complain and he said if someone doesn't like something he's done or said to contact him DIRECTLY, not his mother, because she always believes the other person.
Also, he fell to his knees when jumping off the stage in Newark and had a difficult time getting back up onto the stage. He needed help from Jerome and Angela.