At one point when phoebe reconnects with Wolf; he tells her 'you know my name is really Christopher?' The actor chosen to play wolf is Christopher Eccleston. So in this scene, he is sort of breaking the fourth wall buy revealing his real name.
Christopher Eccleston would later go on to star as Maleketh in Thor: The Dark World (2013) and Jordana Brewster's The Fast and the Furious (2001) co-star Vin Diesel would also join the cinematic Marvel comic book universe as the voice of Groot in Guardians of the Galaxy (2014), Guardians of the Galaxy: Vol. 2 (2017) and Avengers: Infinity War (2018).