On two occasions when Simon Templar is driving his car, on different days in the plot, the back-screen of a London street is exactly the same, with a large lorry having problems getting past a parked van and the same people walking on the pavement.
The Ford Zephyr used by the crooks at the beginning of the episode was registered 545GLP but, when questioned by the police, Simon Templar recalls it as 545GOP.