The villain's Bentley is parked at the bottom of the steps from the Albert Hall, in front of a white Ford convertible - a Zephyr or Zodiac, quite a rare car even in those days. After Harry Palmer has a fight with the villain's sidekick, the Bentley speeds away, and we see the Ford still parked by the curb. Except now, it's dark blue. [Do you think they spraypainted the car while they shot the fight scene? There is easily enough time for the hite car to leave and the blue car to arrive during the very long fight scene.]
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