Elizabeth Holmes and Nathan Fielder Keep Us Guessing

The comedian Nathan Fielder came to fame as the creator and host of the Comedy Central series “Nathan for You.” The show followed Fielder as he devised outrageous schemes, ostensibly with the aim of helping various small businesses. What became clear, though, was that Fielder was less interested in helping business owners generate profits than he was in understanding the people ensnared in his plots. His next project, the HBO series “The Rehearsal,” was a similar offbeat portrait of offbeat people. At the center of both projects is Fielder himself, a documentarian whose motives can sometimes be hard to parse.<...