Continuity mistake: Towards the end of the film, during the fight between Bond and Hans, Hans pulls the shade off the big table lamp and it ends up on the floor. A little while later the shade is on the table.
Continuity mistake: At one point, during the scene with the helicopter dogfight, the tail wing of Bond's mini-copter is riddled with bullet holes (and yet the mini-copter continues to fly very efficiently), but for the rest of the scene, the tail wing is in perfect condition with no sign of the damage done to it.
Deliberate mistake: When 11 is dropped into the water and eaten by the piranha's, although the ravenous fish probably ate most of her and what was on her, there should at least be pieces of clothing that would rise to the surface in the flurry of activity. Not to mention that even though the water is a murky green all the blood from her body should have created a temporary, yet very noticeable darkening of the water.
Factual error: When the Russian capsule is launched, a palm tree can be seen - and it's doubtful that the Russian climate could accommodate palm trees.
Revealing mistake: When Blofeld destroys the volcano lair, as the camera is showing a view of the volcano, you can see the pressure waves move the bodies on the floor and tell that they are obviously dummies.
Plot hole: Blofeld tells the bad guys that they had Bond and let him get away. The woman says "but Bond is dead. It was in all the papers." As we saw in a paper near the start, there was a well publicised photo of Bond, and when she met him he wasn't using any kind of disguise, so how did she not recognise him if she'd seen the papers?
Revealing mistake: When the helicopter with the magnet drops the villains' car into the ocean, look carefully and you can see that the car is empty.
Factual error: When Bird 1 is launched, both in the cave and outside, the exhaust plume and smoke trail is pitifully small compared to the plume of a real rocket.
Revealing mistake: At the beginning of the film during Bond's "funeral", the shot cuts to a man watching the funeral from a boat through a pair of binoculars. The camera then moves to the newspaper next to him showing an "article" reporting Bond's murder. If you look closely at the "article" itself, you can see it was actually pasted onto the actual local newspaper. They probably bought a local newspaper and pasted the fake article over it to make it look authentic.
Continuity mistake: During the car chase sequence, the radio antenna of the black sedan disappears and reappears between shots. It is most noticeable when the sedan is being lifted off. In the close-up as the magnet is attached to the car's roof, the antenna is visible. In the shots in which the car is shown from above, the antenna has completely disappeared.