 She also undertook extensive voice coaching, faithfully reproducing the Queen's delivery of her televised speech to the world.Morgan has said that her performance was so convincing that, by the end of production, crew members who had been accustomed to slouching or relaxing when they addressed her were standing straight up and respectfully folding their hands behind their backs.Mirren arranged to spend time off-camera with the supporting cast playing other members of the Royal Family, including James Cromwell, Alex Jennings and Sylvia Syms so they would be as comfortable with each other as a real family.