Factual errors: The song by Richard Strauss is incorrectly listed in the end credits. It's "Beim Schlafengehen" and not "September."
Continuity: The rear window of Guy's car is smashed when the mob attacks it. The next shot is from inside the car, which shows the rear window still intact.
Crew or equipment visible: When Guy drops Jill at the British Embassy, a member of the crew is reflected in the car window.
Anachronisms: Billy's still camera is a Nikon F2 Photomic, which was not released until 1971, while the film takes place in 1965.
Continuity: In the sudden storm scene, when Guy and Jillian get into his car to get out of the rain. In the close reverse shot of Guy, water is clearly leaking heavily into the car through a crack in the door or window. But in the shot from behind the front seat of both the characters, there is no leak.
Factual errors: Billy Kwan should have the same type of dwarfism as his father, and yet his limbs and body are perfectly normal despite his small size.
Anachronisms: The LE TIGRE t-shirts the reporters are wearing did not come until 1977 - they were not around in 1965.