Evey: My father used to tell me that artists use lies to tell the truth while politicans use them to cover the truth up.
V: A man after my own heart.
As V attacks all of Creedy's men with his knives, in one shot he cuts one man's neck, and blood sprays onto the man's face, but in the next shot as the man falls, his face is clean.
In the scene where Evey gets her hair cut, it was Natalie Portman's real hair they cut. They had only one shot to capture that scene, and everybody was quite nervous if the scene would turn out usable.