Movie reference: the scene in which Daisy finds a sub-machine gun on the kitchen counter and aims it at Mike as he leaves the restroom with a book in hand is an homage to the scene in Pulp Fiction with Bruce Willis and John Travolta.
Movie reference: Tim's opening line, "as far back as I can remember I always wanted to be a graphic artist," is a reference to Ray Liotta's famous opening line in Goodfellas.
Movie reference: The G-Men, in their mannerisms, dress, glasses and ear pieces, are a reference to Agent Smith et al. from The Matrix.
Movie reference: Mike's line when he pulls the pink gun on The G-Men is a reference of Tony Montana's from The Scarface
Four cast members of this episode also starred in another popular British TV show, Doctor Who. In different episodes. Simon Pegg: The Long Game. Season 1, Episode 7. Jessica Stevenson (Hynes): The Family of Blood, Season 3 episode 9. John Simms: several episodes as The Master. And Mark Gatiss: The Lazurus Experiment, Season 3 Episode 6.