This is not the first time James Marsters, who is well known as Spike from 'Buffy', has made a joking reference about vampires during a guest spot on another show. He tells Clark Kent that vampires do not exist when he is on 'Smallville'.
The piano piece Artie is playing when Claudia finds him (at around 24 mins), and again in the last scene with Mrs. Frederic, is the beginning of J.S. Bach's "Goldberg variations" (BMV 988). CCH Pounder (Mrs. Frederic) later played a character possessed by a demon in the movie The Mortal Instruments: City of Bones (2013), where the same piece of music is used to detect demons.
Lost in all the misdirection in Professor Sutton's Office is a woman's portrait with darts in it.
A woman that seems to look like a young Charlotte Dupres.
Professor Sutton and his wife do not get along too well.
Professor Sutton and his wife do not get along too well.
When James Marsters played "Spike" on Buffy, the Vampire Slayer, he derisively made comments about the size of David Boreanaz's "Angel" forehead as well.
Amy Acker guest stared in episode 9 of this season as Myka's sister Tracey. James Marsters guest stars in this episode as professor Sutton. They were regular cast on the show Angel 1999-04(a spin-off of the series Buffy the Vampire slayer. Acker as Winifred "Fred" Burkle and Marsters as Spike.