Sir Michael Caine (Andrew Wyke) played the role of Milo Tindle in the first adaptation of the play: Sleuth (1972).
In this movie, Andrew often mistakes Milo for a hairdresser. In the first adaptation, Sleuth (1972), Milo was a hairdresser, not an actor.
This movie was shot entirely in sequence.
Although the basic situations in this movie and the first adaptation are frequently very similar, all of the dialogue has been completely changed from the 1972 movie and the original play.
(At around thirty-one minutes) At one point in the movie, Milo asks Andrew "What's it all about?" This was the tagline of Alfie (1966) and Alfie (2004), which respectively starred Sir Michael Caine and Jude Law in the title role.
Harold Pinter: (At around thirty-seven minutes) The screenwriter as the police officer on television.
Kenneth Branagh: (At around thirty-seven minutes) As the man being interrogated in the television adaptation of Andrew Wyke's novel.