The Question and Answer section for The Sun Also Rises is a great resource to ask questions, find answers, and discuss the novel.
Brett and Mike send a telegram stating they aren't going to arrive as scheduled because they've taken a detour to San Sebastian.
Mike Campbell dislikes Cohn and treats him accordingly. He regularly makes anti-Semitic remarks and demeans his to his face whenever the opportunity arises.
Mike Campbell hates Robert Cohn because of his brief affair with Brett, Mike's fiance.