At first, this film seems to have only one scene and two shots, one outside and another inside. Actually, it is divided in a series of 8 minute continuous shots. 8 minutes being the maximum duration of filming possible without reloading the camera. Every eight minutes, the camera zooms on a dark object and then cuts.

This was the first film in colour directed by Alfred Hitchcock.

There is a cameo by Alfred Hitchock at the beginning of the film. You can see him walking on the street.