In his latest movie, “The End of the Tour,” Jason Segel stretches from the goofy, lovable characters he normally plays to the role of the tragic genius David Foster Wallace. Also, the writer and director of “The Diary of a Teenage Girl,” Marielle Heller, explains why a relationship between a 15-year-old girl and a 35-year-old man might be empowering. And the indie rock band Yo La Tengo agrees to play a cover of your choosing.