Also; can you use the connecting doors on the Tube? I expect you probably can but no-one bothers. I don't think I've seen anyone ever do it.
Speaking of the Tube, you can't slide along the escalators either, TFL has taken care of that by planting plenty of triangular things in the middle.
Another blooper maybe (should be checked on DVD): in the Tube tunnels, Bond walks through a large puddle of water when he shoots at Silva. Just after that, when he's chatting with Silva, his shoes and the hem of his trousers do not seem wet.