Apologies again for lateness; I've been in Brazil and only just saw this last night.
The Big Bang
Idea Proposed but Not Used in the Davies Era: Ending the Doctor Who universe.
Central Premise Recycled From: Back to the Future.
Reference to Moffat's Back Catalogue: River Song borrows the Doctor's "I'm the Doctor, look me up" schtick from "The Forest of Gump," and Moffat borrows his own "the Doctor seeking help from a small girl who is really the person controlling all this" schtick from the same story.
Gratuitous Scottish Joke: Amy's parents are a pair of Scottish stereotypes: a tall, ginger-haired and nervy woman married to a short, fat, curly-haired man who's terrible at speeches.
Amy Saves the Day with Wuv: Yep. Amy reconciles her Wuv for Rory and her Wuv for the Doctor, and goes off to have the TARDIS' second long-term polyamorous relationship (don't tell me Jamie, Zoe and the Doctor weren't all at it like knives). The Big Bang, indeed.
Tennant Line: None, but we do get the return of "Geronimo."
Star Wars Bit: A seven-year-old child with a Special Destiny, and a special relationship with some kind of universal force.
Nostalgia UK: The Doctor attempts to channel fellow big-chinned media personality Tommy Cooper by donning a fez, though River and Amy both agree that's a terrible idea.
Item Most Likely to Wind Up as a Toy: At first I thought the stone Dalek, but then I noticed the prototype figures for the Amy and Rory Get Married gift set placed on top of the wedding cake...
Something Gets Redesigned: The Earth, though one could also count the stone Dalek.
The Crack in the Universe Is: Closed.