While filming on Tower Bridge, a bus driver believing one of the actors to be carrying a bomb released the bus UNDER ATTACK signal and a counter-terrorism squad was called.
The director never envisioned this to be a large production. He wanted a cast/crew of maximum 10 people. It ended up being a production of over 2000 Cast/Crew.
According to the movie's director, Grigorij Richters, he was stopped and booked by the London police 42 times during 2nd Unit filming.
The director and three of his team members were arrested by a counter-terrorist unit of the police while attempting to climb a high rise to get "the perfect shot" of London.
The director and his main actor accidentally shut down Waterloo Train station while shooting a scene.