Character mistake: At the police station, the detective calls, "George Swinton," but the name is Stewart, not George.
Character mistake: When Frank says to "V" that his mother died before he was born, "V" replies that she doesn't think that's possible. She is wrong. Although it may be uncommon, some babies ARE successfully born even after the death of its mother (usually with an emergency procedure).
Character mistake: Jo says Laurie is a "captive like Smee in 'Nicholas Nickleby.'" There is no such character in "Nicholas Nickleby." The character Jo is referring to is named Smike.