“Extra’s” Melvin Robert sits down with Kate McKinnon, Issa Rae and Michael Cera to talk about “Barbie”! Kate explains how she pulled off her Weird Barbie’s extreme splits, while Issa opens up about playing President Barbie and representation. Michael also dishes on how he took inspiration from *NSYNC for his Allan. “Barbie” hits theaters July 21. (This interview was recorded before the SAGAFTRA strike.)