While he is in his office, Morgus frequently breaks the fourth wall by talking directly to camera. This arose through John Normington misunderstanding a stage direction. But Graeme Harper felt the asides effectively ramped up the dramatic tension, and decided to keep them. It also gave him an air of William Shakespeare villainy.
When Sharaz Jek backhands the Doctor, the mask Christopher Gable was wearing impaired his vision enough to make him legitimately strike Peter Davison by mistake.
This episode was watched by 7.8 million viewers on its original transmission.