Continuity mistake: When Bond is taking off with his Mini-Jet he nearly hits the jeeps and trucks that are chasing him. The landing gear is still down. After the cut you can see the scene from the other side and now the gear is suddenly up. There is no interruption between the two shots, not even the two or three seconds the gear takes to retract.
Other mistake: When Bond drives into the train tunnel, below the train cart with the jewelry, we see that welding is going on in the other train cart. But that is before the bomb is placed in the hole below the cannon. There is no sign of weldings, and no sign of welding equipment once we get inside that cart.Jacob La Cour
Factual error: On the railroad when the knife-thrower is welding the jewel canister onto the circus equipment, there are bright flashes of light. Later however, the knife-thrower attacks Bond with a gas welder. Oxyacetylene torches (gas) merely heat the metal until it melts. They do not produce blinding flashes, unlike arc and MIG welding kits (electric).
Factual error: In some scenes, the Communist soldiers use the wrong armament: the Cubans use American M16s (whereas they should be using AK-47s), and Orlov's bodyguards (in the scene where the jewels are switched for the bomb) have Austrian Steyr AUGs. It would have been rather problematic for socialist countries (during the period of the film) to keep captured Western weapons constantly supplied with spare parts and ammunition.
Continuity mistake: When we see Q fishing, the lighting is totally different from when he's seen from the back in the next clip. Also the bank rises close behind him when seen from the front, but in the next clip the camera position is further back. Those are not shot in the same place. (01:09:30)Jacob La Cour
Continuity mistake: When Bond and the twin fall off the train, Bond's movements do not make sense. In the first clip they are both moving away from the train. In the next clip they are rolling partly along the tracks, partly towards them. In the next clip Bond is rolling forward straight into the bushes. (01:40:25)Jacob La Cour
Factual error: When riding in the truck with the Cuban soldiers Bond pulls their parachutes. In the next clip they are 5-6 meters up in the air. That is impossible. First, parachutes are not shot out, but merely pulled by the passing air. And the truck does not go fast enough to pull the parachutes. Second, even if the truck went fast enough, the soldiers would be pulled horizontally - and just fall off the truck, not get pulled vertically up in the air.Jacob La Cour
Continuity mistake: In the opening story, Bond flies in the small plane with a single jet engine. When the plane approaches the hangar to fly through it (the shot taken FROM the hangar towards the plane) you can see that the plane has TWO engines at the back.
Continuity mistake: When Bond's Mercedes is on the railroad tracks, it is hit head on by an oncoming train. As it is shown sailing in the air backwards, it is very clear that the drive-train has been removed. When the car is shown again, it is now sailing nose first as it hits the water.
Plot hole: Bond falls off the train, and in the time it takes him to reach the air force base the train has arrived and unloaded all of the equipment including the cannon, staged a town parade including the cannon and erected and filled the big top with an audience. You could argue that the big top was sent ahead but the unloading and use of the cannon couldn't have been done in the time frame - would take at least 4-5 hours.