Continuity mistake: When Major Derval steps up to the co-pilots seat and sits down you can see him wearing an orange life preserver and strapping on the white four-point safety harness. However, when he removes the gamma gas from his pocket the safety harness is missing but is back in place in the next scene.
Plot hole: It would not have been possible for Bond to place his jet-pack on the roof of Jaques Bovier's mansion. If he flew up there, everyone would have heard him - it's very noisy. And since it's also quite heavy, it is hard to imagine that he would have time to climb the wall, place it there, and get into the mansion, during the same time it took Jaques Bovier to get back from the church - which he left before Bond did.
Continuity mistake: One for the wristwatch enthusiasts: Towards the end when Bond goes into the water he checks the time on his Omega. Later he looks at his watch and he's wearing the Breitling with built-in Geiger counter that Q gave him. Both shots are long and clear, probably because the watchmakers paid for them.
Continuity mistake: Near the end of the film as James Bond swims towards Palmeras, he gets out of the water to go up a flight of steps, and you see that he is wearing red shorts that are wet as he gets to the top. You then see a shot of Largo's henchmen getting into the back of a truck, as Bond goes down the next flight of steps the shorts are no longer wet, and they are now much lighter in colour.
Continuity mistake: After Bond had been dancing with Domino, Largo takes her to his jet boat to return to the Disco Volante for the night. Just when Largo asks her, "What was he saying just then?", in the background one can see Felix Leiter taking his sunglasses off and approaching Bond. Bond even turns his head towards him. The scene continues with Domino and Largo leaving in the jet boat. The scene cuts and the next shot shows Bond with Felix Leiter standing some steps behind him again, still wearing his sunglasses. (00:51:55)
Continuity mistake: James Bond is in the Shrublands clinic. He is snooping in a patients room. The patient (with bandaged face) opens the door. Bond hides behind the door and reaches into his jacket for his gun. A widescreen shot then shows his arm hanging down but in the next shot,his arm is back in the jacket. (00:13:05)
Continuity mistake: During the fight at the beginning of the film, you can see the fire in the fireplace burning brightly but when Bond is throttling his attacker with the poker, you now see that the fire (though partially hidden by the table) has nearly gone out, and does not burn as brightly. (00:03:10)