A deadline disrupts Sterling Cooper Draper Pryce.The first Clay/Liston fight took place Feb. 25, 1964. The second, the one Don and the gang are talking about, on May 25, 1965. Despite all the references to “Clay,” Cassius Marcellus Clay Jr. had already changed his name to Muhammad Ali at this point in history. Episode titles: 4.1 Public Relations 4.2 Christmas Comes But Once A Year 4.3 The Good News 4.4 The Rejected 4.5 The Chrysanthemum and the Sword 4.6 Waldorf Stories 4.7 The Suitcase 4.8 The Summer Man 4.9 The Beautiful Girls 4.10 Hands and Knees 4.11 Chinese Wall 4.12 Blowing Smoke 4.13 Tomorrowland 10 p.m. Sunday. AMC.