Linwood says, "Lilah, this is my corner of the sky. I decide when the sun rises and when it sets..." John Rubinstein was the original actor to play the title role in the Broadway musical "Pippin" whose signature song is "Corner of the Sky".
Vincent Kartheiser has been added to the opening credits, while Alexis Denisof has been moved to last (and is now credited with 'And').
Angel says, "I got stuck in a hell dimension by my girlfriend one time for a hundred years" referring to when Buffy sent him to hell in Becoming: Part 2 (1998).
Season 4 brought numerous changes behind the scenes with Joss Whedon, David Greenwalt and Tim Minear leaving. David Simkins was brought in briefly, though by all accounts, he did not mesh with the show's established sensibilities. He was only involved for a few months, and his responsibilities were later transferred to "Angel" writer Jeffrey Bell.