Continuity mistake: Bond gets on the Tube at Temple. Then when he gets off at the next stop the first visible platform sign still shows Temple -before then changing to Embankment.
Continuity mistake: When M gets into the Jaguar making her escape from the court hearing she is in the rear offside seat behind Bond. A few seconds later, when viewed in the rear view mirror by Bond, she is on the other side of the seat, still belted up.
Continuity mistake: At the Shanghai Casino, Bond puts the very expensive chip on the bench between him and the cashier, who doesn't touch it, but leaves it behind as she gets her boss and the suitcase that holds a lot of money. As Bond walks away, it is gone.
Continuity mistake: When Bond is on the train, before he gets into the backhoe, the number of people and cars on the street keep changing. Even if the train moved forward, the people/cars seen in the next shot weren't seen in the previous shots.
Answer: Silva's objective was not just to kill M - if it was, he could have blown up her office with her in it when he hacked into MI6 the first time. He wanted to humiliate and terrify her by showing he could get to her again and again, whatever measures were put in place to protect her.
Sierra1 ★