Midway through the film, Andrew Carmel drives through the village on his way to his parents' country house. However, when Belinski leaves the Carmel house he is driven through the village traveling in the same direction on the same road as Andrew was driving towards the house.
The professor played by Boyer is supposed to be a Czechoslovak, yet he has a Polish name: Belinski.
When Cluny enters Mr Wilson's Chemist shop the bell on the door rings upon opening. The door closes, and the bell can be seen ringing but no sound is heard.
When Cluny and Adam and Hilary are in Hilary's living room, just after Cluny says "It's so wonderful to be a cat and read the Daily Mail," the boom mic can be seen in the mirror above Adam's head.
At one point where Mr. Belinski, who is supposedly Czech (but is played by the very French Charles Boyer), addresses a man in a very quick bit of dialogue, he distinctly says "Monsieur" instead of "Mr."