Dame Helen Mirren says transforming herself into the Queen came almost naturally after the wig and glasses, especially since she shares a default facial expression, a slightly down-turned mouth, with the monarch. She also regularly reviewed film and video footage of Elizabeth and kept photographs in her trailer during production. Screenwriter Peter Morgan said it was convincing enough 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.