 SPOILER: For a dose of authenticity in the final twist at the end of  the film, the actors were not told, prior to filming, that  Geoffrey Rush (qv) would be appearing in the movie. They were  told, before the scene was shot, that the person coming down the  stairs would be Anamaria (Zoe Saldana (qv)) from The Curse of the  Black Pearl; the looks of surprise on their faces as Rush descends  are genuine.