Not even the rare "double vomit" could save it: HBO has opted not to renew Lisa Kudrow's sitcom- and reality-TV-skewering series The Comeback, which wrapped up its debut season on Aug. 28  by having plucky Valerie Cherish receive the very good news that "The Comeback" had been picked up for another season. That, my 11th-grade English teacher confirms, is irony.