Audio problem: When - during the sword fight - the sabre is thrown to the wall, it makes a high frequency sound - like a knife or an arrow. The sound of a sabre would be much lower frequency.
Audio problem: In the scene where Bond is at the reception at the Ice Palace and is following Mr. Kil and Vlad, when the guard points his pistol at Bond and orders him to put his hands up, you can see that his lips do not move. (01:17:30)
Audio problem: In the sword fight scene Graves asks "Is a thousand a point too much for you?" and the next shot shows Bond's lower jaw mouthing something more interesting than "Hmmm".
Audio problem: During the sword fight when the saber hits the floor it makes a metal-to-stone sound. However the floor is carpeted.
Audio problem: When Jinx shoots the doctor the second time, she stands up and you hear the gun shot BEFORE the scene changes. However, there are four pieces of information that suggests they should not have added this sound before the change in scenes: the slide on the gun doesn't pull back, no bullet ejects from the chamber, she doesn't seem to pull the trigger, and no bullet comes out of the gun.
Audio problem: When Bond meets M at the underground station, he walks through a door and turns slightly to his right. Cut to the platform as Bond walks towards M - we hear a door close behind him, but there is no door behind Bond when he is on the platform. This scene starts as he walks towards the arch on his left - no door there either.
Answer: By this stage, it's become a habit.
J I Cohen