Flight of the Conchords ’ return to the stage, after an eight-year hiatus, featured its rough patches. “We could have benefited from another week of rehearsal,” Jemaine Clement admitted wryly, somewhat late into the night of their final show at the Greek Theater in Los Angeles. There were some awkward starts to songs, a few instances of forgotten lyrics, and Clement having to remind Bret McKenzie , at one point, which instrument he was meant to play next. However, to put it bluntly: even Clement and McKenzie’s worst night on stage would be more entertaining than 95% of the other acts out there, minimum. And their Netflix Is a Joke Fest appearance on May 10th was the furthest thing from a disaster, thanks to their innate musical talent, the story-driven craft of their songwriting, and their ever-affable Kiwi charm, soaked in self-deprecation.…