Continuity mistake: When Blofeld is just about to shoot Bond with a Webley & Scott Mk. IV revolver in .455 Webley caliber, Blofeld's hand is hit with a ninja throwing star. However, the gun he drops isn't the Webley, but a Smith & Wesson .38 Special.
Revealing mistake: In the car chase, the girl keeps the steering wheel straight all the time (in the shot from inside the car), although the street is not straight at all. Must have been a self-steering car...
Revealing mistake: During the car chase scene, if you watch the speedometer on the car, it never rises above zero. That and the obviously poor image quality of the "road" in front of them shows that they were using projected film in front of the car.
Trivia: For production Designer Ken Adam's giant Pinewood volcano set, some 700 tons of steel were used and some 250,000 square yards of canvas. It featured a working monorail and elevators and cost $1 million to produce.
Trivia: German actress Karin Dor almost suffered decapitation by the helicopter rotors in the scene where she and the actor playing Osata meet Bond for the first time. Only an attentive crewman, who shouted a warning at her, prevented it.