Yes, the Recyclingwatch feature returns again, to general fanfare. This episode sets the tone nicely...
Rose: Glimpse of companion's pre-Doctor life, with unsatisfactory family, lousy job experiences, and Billie Piper. Companion turning to conspiracy theory websites to explain the Doctor. Companion's Mum nagging her about her employment status. Some woman propositions the Doctor only to be bluntly turned down.
Aliens of London/WW3: Nasty things happening to fat people; cute but fatal aliens, fart-based humour.
Bad Wolf: Another Anne Robinson look alike (see below)
New Earth (and Gridlock): "I've met cat people, you're nothing like them..."
School Reunion: Doctor and ex-companion both investigating same thing at same time, with comedy hijinx.
The Idiot's Lantern: The Doctor and companion try to get to the bottom of strange happenings by knocking on the doors of ordinary people and pretending to conduct a survey.
Love and Monsters: Ordinary person whose life was briefly touched by the Doctor subsequently spends ages trying to track him down.
Army of Ghosts: Check out the advert for the ectoplasm polish, and ask yourself who that cute little ghost reminds you of (the sound people have even recycled the noises it makes).
The Runaway Bride: Oh, go on, guess.
42: Silent dialogue between the Doctor and companion, behind their own separate windows.
The Sound of Drums/Last of the Time Lords: The villain has their own version of the sonic screwdriver.
Voyage of the Damned: Bernard Cribbins reprises his crusty-old-granddad bit.
Sarah Jane Smith: Invasion of the Bane: The plot of PIC is essentially an adult version of the Sarah Jane pilot, only with diet pills instead of fizzy drinks, and some extra added body horror. Even the two villainesses look almost exactly alike, and have a penchant for kinkily victimising nosy female journalists.
Old Skool Who: Not much, surprisingly: The Invasion (rooftop exploits with armed guards, attempt to escape in a lift). Robot (the source for all the creepy business-suited crypto-lesbian villainesses). Any story featuring an evil megacorporation with a popular product as chief villain (The Green Death, Spearhead from Space, Terror of the Autons...)
Everything Else: The sheer number of referents for the appearance of the Adipose is staggering (The Stay-Puft Marshmallow Man, the Scrubbing Bubbles, Pokemon, the Smurfs, the Death Guard). Gremlins (cute, seemingly harmless aliens with food-related issue). Mary Poppins (Nanny flying through space over London); Harriet the Spy (children, by implication, experiencing separation anxiety when their parents get rid of Nanny); Shivers (body horror involving beings inside people trying to get out); Alien (the scenes involving the birth of the Adipose are like a teatime comedy version of John Hurt's famous chestbusting incident). Close Encounters of the Third Kind (the giant Adipose mother [sic] ship). The Weakest Link (Anne Robinson's look/stage persona).