Revealing: In the scene where Bond is trying to escape with his new Mini-Jet, he flies through a big hall. If you look carefully, you can see that the aeroplane which is supposed to be flying with its wings vertical is fastened to some kind of sustainer.

Revealing: The nail-bed's steel nails that James Bond flips a henchman onto are the most obvious rubber nails ever seen in a film. They ALL move like crazy rubber in a bunch of separate directions when he falls onto them, including ones he never even comes close to touching.

Continuity: At the end of the film, Bond chases Kahn following the battle at Octopussy's mansion. In the short time it takes to run to a nearby plane, it turns from pitch darkness to bright sunshine.

Factual error: Bond tells Q at one point "I've lost my PPK." However, he has been carrying a Walther P-5 throughout the movie, and continues to use it in the later action sequences. A PPK never does make an appearance in the movie. The P-5 was also used that year by Bond in "Never Say Never Again").

Factual error: During one of the chases, when James Bond hops into the water, he is picked up by a group of American tourists on a tour boat.  The city of Cincinnati is misspelled as Cincinatti on it.

Factual error: At the East German / West German checkpoint, there is a level crossing. The warning signs for road traffic are clearly visible and are unique to the UK (where the shot was filmed).

Revealing: When the police cars chase Bond and stop outside the circus, you can clearly see a lot of brake-marks. It's quite obvious that the filmmakers re-shot the scene several times, before they got it right, but didn't bother to remove the marks made in earlier takes.