Factual error: When M and his entourage arrive at Bond's estate, their cars are surrounded by sheep. They then drive on down an unsurfaced road to Bond's house, past a pride of lions he keeps on the grounds. A series of sweeping overhead shots shows us that it is all one huge field, with no fences or the like. Those sheep aren't going to last very long.
Continuity mistake: When Andress is taken hostage outside the casino, watch the background to see the bouncer walk inside the Royale. Yet, when Sellers runs outside, the bouncer is outside again. (01:41:00)
Continuity mistake: There are several differences between the miniature model of the hovercraft-like thing that Mata is in and the full-size model. For example, the full-size model has red markings near the antennae and a silver bottom, whereas the miniature has no markings and a predominantly red bottom. (01:49:35)
Continuity mistake: When the bed with Peter Sellers on it starts lowering, from one angle the bed's dropped below the level of the ground around it, but then in a closer shot of Peter Sellers, we can see behind him that it's not moved. The next, wider, shot shows that we should have seen the hole's walls behind him. (00:49:50)