Continuity mistake: Early in the first season it was established that Darien's parents died in an accident, and that he and his brother were raised by an aunt and uncle. But here, Darien's father is alive, is said to have "disappeared" years before, and there's no mention of the accident he "died" in.
Darien Fawkes: By the way, I want my tombstone to say, "Too late, he's already dead." You know, just in case more people show up wanting to screw my life over.
Trivia: A number of in-joke Dr. Who references crop up throughout the series pilot. A group of doctors and scientists are introduced as Hartnell, Troughton, and Baker; there's a business card for I. M. Foreman in Totters Lane; and the cover of a science magazine sports headlines such as "Time and Relative Dimension in Space" and "Playing the Game of Rassilon."