Definetely Mickey is a great addition to the show. Him being Kramer´s "friend" is fantastic. I love his personality and the way he gets along with Kramer.
So Jerry doesn´t succeed when he tries to make a sick person laugh, now, how many times have we seen that???
Jerry sets up Elaine with one of his friends and the date doesn´t go well. It was funny when Jerry meets him later and tells him that he showed him who he is. I liked the dialogue between Jerry and Elaine when she tells him what happened. And Kramer´s reaction is hilarious.
George... well, we know George. Staying in a relationship that will go nowhere so his pride doesn´t get hurt.