“Iris Caldwell remembered an interesting incident in connection with the song. She had broken up with Paul in March 1963 after a silly argument over her dogs (Paul wasn’t too keen on dogs at the time) and, when he later called up to speak to Iris, her mother told Paul that her daughter didn’t want to speak to him because he had no feelings. Two and a half years later, on Sunday August 1, 1965, Paul was scheduled to sing ‘Yesterday’ on a live television programme, Blackpool Night Out. During that week, he phoned Mrs. Caldwell and said: ‘You know that you said that I had no feelings? Watch the telly on Sunday and then tell me that I’ve got no feelings’“.
(Steve Turner, A hard day’s write)