Two of the buzziest — and most star-studded — movies world premiering in competition at this year’s Berlin Film Festival , “ Rosebush Pruning ” and “At the Sea,” are from two decidedly non-Hollywood filmmakers but feature top talent from the U.S. and U.K. “Rosebush Pruning” — a biting family satire helmed by Brazilian auteur Karim Aïnouz that debuted on Saturday — boasts an impressive heavyweight ensemble including Callum Turner, Riley Keough, Elle Fanning , Jamie Bell, Lukas Gage, Tracy Letts