Every Thursday, the actor, comedian and producer Tim Heidecker hosts open-line “office hours.” Fans of his absurdist comedy, most of which runs on Time Warner’s Adult Swim network, call in to talk. On most days, they run the gamut from fans to superfans. But on Dec. 8, Heidecker took a call from Sam Hyde, the face of the comedy troupe Million Dollar Extreme. Its own Adult Swim series, “World Peace,” had been scrapped after a six-episode run. “Didn’t you want the show canceled?” asked Hyde. “Didn’t you campaign against our show?” For 12 minutes, live on Facebook, Hyde mocked Heidecker’s...