(at around 1h 40 mins) The domino scene, where V tips over black and red dominoes to form a giant letter V, involved 22,000 dominoes. It took four professional domino assemblers 200 hours to set it up.
(at around 1h) For the scene when V emerges from Larkhill, stunt double Chad Stahelski literally walked through fire, wearing just a special fire resistant gel and a g-string. Stahelski's body temperature had to be lowered before the scene was shot, and luckily, it was three degrees below zero the night of the shoot. Fifteen minutes before a take, he would put on ice cold flame resistant clothing, and once he took them off, he would be covered with fire resistant gel which had been icing all day long.
The cast and crew were allowed to shoot near the British Parliament and Elizabeth Tower (also known as Big Ben) from midnight to 4:30 a.m. only, and they could stop traffic for only four minutes at a time.
One of the major challenges in this movie was how to bring V to life from under an expressionless mask. Thus, considerable effort was made to bring together lighting, acting, and Hugo Weaving's voice to create the proper mood for the situation. Since the mask muffled Weaving's voice, his entire dialogue was re-recorded in post-production.
The Secret Police are called "Fingermen", because the New Order was arranged on the model of the human body. The Chancellor was the Head; the television station BTN was the mouth; visual and audio surveillance were the Eyes and the Ears; Inspector Finch was part of The Nose, the Police force, and Creedy's Secret Police were the Hand.