SAG prexy Ken Howard and “Hot Tube Time Machine” star Clark Duke are set to round out the cast of Black Bear Pictures’ comedy “A.C.O.D.,” which Stuart Zicherman is directing from a script he co-wrote with Ben Karlin.Adam Scott stars as a man who learns he was enlisted in a study about divorced children many years ago. When he’s ushered into a present-day follow-up study, it creates new havoc for his family. Pic co-stars Richard Jenkins, Jane Lynch, Amy Poehler, Jessica Alba, Mary Elizabeth Winstead and Catherine O’Hara. Howard will play Scott’s amicable stepfather, whose calm demeanor can’t save him from becoming enmeshed in the family drama. Duke will play Scott’s younger brother, whose sudden wedding announcement brings his bitterly divorced parents back into each other’s lives. Teddy Schwarzman is producing and fully financing “A.C.O.D.” through his Black Bear Pictures shingle. Karlin (“Modern Family”) and Tim Perell (“World’s Greatest Dad”) will also produce. Black Bear, which recently wrapped the Mark Wahlberg-Russell Crowe thriller “Broken City,” will produce J.C. Chandor’s Robert Redford-starrer “All is Lost.” Howard recently appeared in Clint Eastwood’s “J. Edgar” and can currently be seen in a recurring role on NBC’s “30 Rock.” Clark, who previously co-starred in Matthew Vaughn’s “Kick-Ass,” can currently be seen opposite Eddie Murphy in the Paramount comedy “A Thousand Words.” Thesp is also directing and producing “Pinfall,” a pilot presentation he wrote for FunnyOrDie.com that stars Nelson Franklin and ‘Rowdy’ Roddy Piper as himself. Howard is repped by Greene & Associates Talent Agency and manager Randy James, while WME and Mosaic rep Duke.