The cast and crew were only allowed to shoot in the area near the British Parliament and Big Ben from midnight to 4.30 am. Furthermore, they were only allowed to stop traffic for 4 minutes at a time.
Natalie Portman looked forward toshaving her head totally bald for the role of Evey Hammond during the torture scenes, stating that she has wanted to do it for a long time. For the shaving scene, the crew and the shaving guys had only one take to do it.