Continuity: Charlie's fingers, when he is dead, change positions when suspects arrive.

Continuity: When the French inspector is interrogating Audrey Hepburn, he asks "Why did he wanted to leave France?". Shot changes to the back of the inspector and Audrey replies, "Leave? No". Then the inspector makes a rough movement with his body and head to his right, but the movement is brusquely cut and replaced by a front shot where he is sitting perfectly still, as he was doing in similar previous front shots.

Continuity: The lights on the Seine tour boat go out, but in the long shot they are still working.

Factual error: The sign outside the embassy reads "American Embassy", it should read "Embassy of the United States of America". North & South America are continents, not a country.

Continuity: When James Coburn is about to leave the phone booth where he's been lighting matches, the number of matches he leaves on the top of the phone changes between shots.

Visible crew/equipment: As Reggie and Sylvie are walking around the indoor swimming pool, the boom arm and mic are reflected in the glass as they turn the corner.