Continuity: At the beginning of the film, Roy got out of the car and wanted to walk across the Waterloo Bridge alone, and ordered the driver to wait for him on the other side of the bridge. The movie started to flash back when he was walking, but in the final shot, they were seen driving across the bridge and then leaving.
Anachronism: Although the film took place during the First World War before 1920, all the dresses and hairstyles of the heroine Mara were in fact the most popular in the 1940s.
Anachronism: Shortly after the beginning of the film, after the air raid warning ended, Roy and Mara came out of the underground air-raid shelter. You can clearly see a traffic light at the top right of the screen. The first time that traffic lights appeared in London was 1931.
Display error: When Roy took the special express train back to London from Scotland, the train showed the Great Western Railway. In fact, this company was only responsible for the railway transportation from Paddington in London to West England and Wales.
