In Mark Lewis' "home movies," Prof. A.N. Lewis is played by director Michael Powell, young Mark Lewis is played by Powell's real-life son, Columba Powell, and Mark's mother, seen lying lifelessly in bed, is played by Columba's real-life mother, Frankie Reidy.
In his memoirs Michael Powell revealed his other candidates for the role of Vivian as being Joan Plowright (rejected as 'too sympathetic') and a young Julie Andrews (rejected as 'too famous'). He eventually chose Moira Shearer despite initially describing her as 'too glamorous'.
This is the British counterpart of Psycho. Though it was banned for many years and so it did not become a box office smash like Psycho, filmmakers that saw it when it opened cite it as being similarly influential, maybe more so, because although the set pieces are more artfully constructed in Psycho, the killer in Peeping Tom is much more tragic and sympathetic, a major innovation for film at the time.
The trivia item below may give away important plot points.
The film was heavily cut by the BBFC before release and consequently many scenes still have a ragged feel to them. The murders of Vivian and Dora were toned down, shots of nudity were deleted (including photos of nude girls in the album), the suicide of the killer was shortened, and scenes featuring the spike were also edited. Some dialogue was also cut (which explains the abrupt ending to the conversation between the policemen in the car). Although some cuts were restored in later video and DVD releases much of the edited footage is now considered lost forever.