Goodfellas: "As far back as I can remember, I always wanted to be a graphic artist."
Grange Hill: Tim and Daisy watch one of the characters getting killed in a rerun
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Daisy's netball team experience is drawn in a similar style to the old opening credits complete with theme music.
Grease: Daisy when job hunting, describes her sweet and rebellious sides which are made to resemble Sandy before and after her makeover in the film. The employment agent even tells her "You better shape up. You better understand."
Green Card: Tim and Daisy don't remember the name of the film when they take pictures of themselves to hold up the ruse of being a couple.
Hawk the Slayer: Don't call it rubbish in front of Bilbo Bagshot.
John Ford: the slow pullback from a closing door that ends the last two episodes of season two is a homage to this director, who was fond of ending his films this way.
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The King and I: "Getting To Know You" plays during a montage of Tim and Daisy while apartment hunting in Episode One.
Krull: Bilbo mentions when he suggested watching it to his dad, when talking to Tim.
Judge Dredd: Tim has a Judge Dredd poster in his room. Several issues of 2000 AD are read by various characters over the course of the series, generally featuring Dredd on the cover.
Jurassic Park: Duane's run-in with the young hooligans in Gone is a tribute to big-game hunter (and velociraptor entree) Muldoon's death scene, complete with obscured mauling.
Roobarb: The theme is used for the scene where young Tim is being chased by the dogs and when we see the young Daisy chasing after the aforementioned dogs.
The episode Chaos begins with Brian explaining how the entire series is the result of the gunner on the Star Destroyer's decision not to shoot R2 and 3-P0's pod. Later, the planning sequence for Colin's rescue is built entirely on Star Wars references, including character codenames and an imperial march remix as the background music.
Tim/Han: Now, the facility is surrounded by a two-meter high fence, so we'll have to climb over it.
Mike/Luke: Two meters? That's impossible, even for a computer!
When Daisy opens the lipstick Marsha gives her for her birthday, the lightsabre sound effect plays.
Strontium Dog: Mike tells Tim not to forget whose shoulder he cried on when Johnny Alpha got killed by "that big flying monster."
Tekken: Used as a Framing Device for the massive fight Tim and Daisy have at the end of the first series
The Texas Chain Saw Massacre (1974): In the opening scene of 'Dissolution', the sound effect when the photographs are taken are the same as the opening of the film.
Titanic (1997): The cut to Tim "masturbating over Gillian Anderson" shows his hand hitting a magazine in a style that echos the climax of the love scene in the back of the car in the cargo hold.