At about eight and a half minutes, in the shot showing the outside of Grosvenor House, the black cab parked at the left side of the screen has the number plate YXN 74. About five minutes later, in Threadneedle Street a bus and two black cabs pass in front of the camera. The second cab has the number plate YXN 73 - a remarkable coincidence.
The building site featured at the end of the film is the London Hilton, Park Lane.