Factual error: When M and his entourage arrive at Bond's estate their cars are surrounded by sheep. They then drive on down a unsurfaced road to Bond's house, past a pride of lions he keeps on the grounds. A series of sweeping overhead shots shows us it is all one huge field, with no fences or the like. Those sheep aren't going to last very long .
Continuity mistake: There are several differences between the minature 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 minature has no markings and a predominantly red bottom.
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.
Continuity mistake: Forydize says the Tremble has a 1965 Rolex Oyster Perpetual. Q gives Tremble a replacement that is meant to be the same, but with the radio and TV screen built in - Tremble says that he cannot tell the difference between the new watch and his original. But when a closeup of the new watch is seen, it is not a 1965 Rolex Oyster Perpetual.
Continuity mistake: After drinking the drugged champagne Tremble collapses the instant he enters the bathroom. But when we see him passed out against the bath he doesn't have his braces and holster on. They're hanging over the side of the bath but there was no time for him to have taken them off.
Revealing mistake: Mata is kidnapped and taken to Casino Royale in a flying saucer, which then releases a small hovercraft to bring her inside the island cave. Once inside the cave, the hovercraft leaves the water and goes up a ramp, at which point a tow cable can be seen pulling the hovercraft up the ramp and onto the landing platform.
Continuity mistake: Most of the time that Le Chiffre is playing cards the women gathered around him are in the same position - e.g. the blonde twins are either side of him and the woman in the bright green dress is to his right. However there is one short shot, just before Le Chiffre does his levitating woman magic trick, where they are all in different positions - e.g. the woman in the green dress is now behind him to his left.