Go to the chase scene where James Bond chases the Cigar Girl on the Thames in his cool little black boat.

Over by the Millennium Dome (it is the big white dome at the end of the scene), Bond chases her onto the land next to the dome, and she hijacks the balloon. Look at Bond's boat...when he fires the torpedoes, the boat has a roof, when he races up to the shore, it has a roof, and when he jumps the boat on the Cigar Girl's boat, it has a roof....until when the camera cuts to James Bond jumping from the boat and grabbing the rope attached to the balloon. Doesn't it seem impossible that James could jump up and out of the boat if it had a roof? When he jumps, the roof has magically vanished.