Other mistake: When Bond arrives on the island with the fake volcano, Kissy tells him that nothing unusual has happened there, except the death of a diving girl when she ventured into a cave. Even if the construction of the launch facility in the volcano had been kept secret it would have been impossible to launch the large rocket twice without anybody noticing.
Continuity mistake: The first time we see the fake lake retracting in the volcano it is moving very fast, and before the cut it is almost totally retracted. But in the next clip when seen from below the opening is only half of the crater and the roof is retracting much slower.
Add timeJacob La Cour
Deliberate mistake: When 11 is dropped into the water and eaten by the piranhas, 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, but very noticeable darkening of the water.
Add timeTobin OReilly
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?
Add timeJon Sandys
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.