Corrected entry: When Bond's mini-jet runs out of fuel, he coasts into a back-water gas station and tells the attendant to fill it up. However, jet engines do not run on gasoline. They burn jet fuel, which is essentially kerosene.
Corrected entry: When Bond flies the mini-jet through the hangar, he banks the wings to get through the closing doors, to the point where the wings are vertical as the plane exits the building. The problem is, aircraft are turned by banking the wings; if the wings are banked, the aircraft is turning, and the greater the bank, the tighter the turn. The hangar would have had to be almost u-shaped for Bond to have made it through.
Corrected entry: After a long chase through the Indian streets, Bond goes to MI6's local HQ and gives the egg to Q to put a tracking device/bug into it. This was the same egg Bond showed off at the casino and was why he was being chased. Since MI6 had complete possession of the egg after Bond switched for it at the auction, they could have put the tracking device on it at any time before Bond took it to the casino. It makes no sense for Bond to risk losing the egg before it is properly adorned with the bug, especially given the risk he takes tempting Kamal Khan with it at the casino.
Corrected entry: When General Orloff runs to his car, shouts "driver" and grabs the door handle, there is no one in the car.
Corrected entry: What did the jewellery smuggling and the fake jewels have to do with the A-bomb? It wasn't payment to Kamal for services rendered, since the jewelry was transferred to General Orlov's car while Gobinda was watching. Kamal and Orlov could easily have placed a bomb in the circus without the jewelry-story.
Corrected entry: When Bond falls between the railway carriages fighting the man with the scimitar, the brake hose is sliced and Bond sprays him with the air rushing out. If these lines are cut or broken, the brakes in the entire train come on automatically and stop the train, they cannot be cut and the train keep moving. I am a train driver, and this is called (obviously) "Losing all your air" and stops a train quick smart.
Corrected entry: The performance of the Octopussy Circus is amazing. After the performers left K-M-Stadt by train, the Russian soldier explains in the train that the maximum delay of explosion for the bomb is four hours. After the train has crossed the inner-German border, Gobinda activates the bomb, which will be deactivated by Bond just in time. Within these four hours: 1) the circus goes about 100 km from the border to the US base "Feldstadt" near Nürnberg (to be seen by the "N" on the numberplates of the police cars) 2) the circus celebrates a parade through Feldstadt 3) the circus people put up the tent 4) the circus performs a whole show.
Corrected entry: How does old Q manage to float into the middle of a gun battle in the castle, knocking out some soldiers, without being at least shot at by a stray bullet? He doesn't even take cover in the basket. And when he lands, his balloon stays inflated and still nobody shoots at it. Fat chance of the bad guys hitting James Bond if they can't hit a hot air balloon.
Corrected entry: When Bond and Khan are playing backgammon, Khan says that Bond "must" throw a double 6. But Khan's pieces are on the 3&4 spaces, which would not guarantee him a win.
Corrected entry: In the beginning of the movie Bond's predecessor is killed in the line of duty while clutching a counterfeit Faberge egg. In an effort to sniff out the counterfeiters Bond attends a Sotheby's event where the real egg is being put up for auction. When bond returns to headquarters, we're told and Bond modestly brags to his superiors that through careful slight of hand he switched his counterfeit egg with the real egg during the bidding process. So the buyer (the bad guy) purchased the fake egg instead. Back at headquarters (after the auction/switch scene) Q inserts a bugging device in what would have to be the real egg. Later in the movie however, the fake egg is destroyed over an argument between the two bad guys which results in the bug being exposed. How did the bug get implanted into the fake egg? Q put the bug into the real egg after Bond came back to headquarters from the auction.
Corrected entry: After James and the Yo-Yo assassin fall into the water, one of them is eaten by a crocodile/alligator. We see the arms of the victim being pulled under and he has sleeves. This must be James, as the Indian had no shirt on.
Corrected entry: The cannon is too big to fit in to the railway freight carriage, as the loading doors are in the wrong place for this size of equipment.