Aarcflick

 Mostly, "My Next Guest Needs No Introduction" is about David Letterman's beard. The bushy protuberance is a 6- to 8-inch addition to Letterman's face, and it seems to be the threshold between the host of "The Late Show" (who retired in 2015) and the roving, eccentric interviewer he has since become. Letterman's CBS persona had no room for a beard, and whatever the beard might represent. His Netflix persona has so much facial hair that it's a talking point. President Barack Obama jokes about it, as does Letterman's second interviewee, George Clooney; Letterman pokes fun at it while at home with Clooney's parents in Augusta, Kentucky. (I don't yet know if Malala Yousafzai, his guest for the third episode airing in March, has the same sense of humor, but I wouldn't be surprised.) It's as if the beard is a wardrobe change, an icebreaker, and the elephant in the room—it's a no-brainer. To observe the beard is to observe that Lette...