Revealing mistake: During the shoot-out, all the baddies' heads and hands are bare, except for the one that gets burnt alive, who wears very obvious fireproof hood and gloves.
Continuity mistake: When Bond exits the tunnel 2 workmen gather on the right side. A shot later one of them is now on the opposite side.
Continuity mistake: When Largo introduces himself to Bond the toothpicks on the counter disappear.
Continuity mistake: When Bond is about to massage Domino he says he's never seen her before. Both of her arms are extended and fall down over the stretcher, but when the shot changes the left arm is bent below her head.
Continuity mistake: After fighting against the shark, Bond swims upwards and there's a lady holding a fishing rod. The position of her hands changes between shots.
Revealing mistake: After Nigel and Bond meet and stop walking, there's a group of bystanders behind staring at the shooting of the movie.
Continuity mistake: After Fatima dies, the position of her shoes changes between the first and second shot.
Visible crew/equipment: After the motorbike jumps over the car, a close-up of the car's rim reflects the camera rig.
Continuity mistake: When Bond closes the door to stop the shark from entering the cabin, he uses both hands. A shot later the right one disappears.
Continuity mistake: Largo's men leave the fishing boat in full on wetsuits to recover the warheads but the men who retrieve them are wearing sleeveless wetsuit tops and wetsuit shorts, also the wrong wetsuits for the colder UK waters.
Other mistake: When Fatima Blush intentionally water-skis straight up the ramp to the waterfront bar where James Bond catches her, she apologizes, "How reckless of me! I made you all wet!" To which Bond replies with his classic line, "Yes, but my martini's still dry." However, Bond's beige sport jacket (which should instantly show any water stains) is not in the least bit wet.
Revealing mistake: Before Bond throws the urine specimen in Lippe's face during their fight at the health farm, look at the beaker and you can see a tablet dissolving in the water.
Revealing mistake: When Fatima is blown up by the explosive charge, there is a wide shot of a dummy standing in her place.
Continuity mistake: When the XT-70s are launched, you see Polaris A1 missiles (single warhead) being launched, In the next shot you see Polaris A3 missiles (multiple warheads) flying.
Visible crew/equipment: Before the chase between Bond's bike and Fatima, right when Bond opens the box where the bike is in, a lighting screen is reflected on the front light of the bike.
Continuity mistake: Right before Bond grabs a bike and chases Fatima Blush, he is eating an apple which swaps from yellowish-red to fully yellow, between shots.
Continuity mistake: When Bond's bike is trapped in the tunnel, two white and black cars stop behind him, and two baddies with chains exit. When the angle changes, Fatima exits her car and everything's repeated: the two cars come to a stop and the baddies exit again.
Continuity mistake: While riding the bike, Bond's helmet swaps from bright to matte between shots.
Continuity mistake: During the credits Bond jumps into a window. From the outside, the window to the left of where Bond jumps through, is complete; from inside the house the window is shed to pieces.
Continuity mistake: When Bond and Domino jump into the water from Palmyra, the Arabs are shooting at them with rifles from the wall. The submarine starts shooting at the top of the wall. But in the second shot of the submarine it is very far in the background - shooting at a point in the wall which is very very far from where Bond and Domino are in the water.
Chosen answer: Neither is a professional dancer. Having studied dancing some thirty years before does not mean someone has retained the same level of skills. As you mentioned, Connery was in his 50s by that time.
raywest