The opening shot, where a *huge* spaceship enters the frame from the top of the screen, pointy end first, and keeps revealing more and more of itself, is like the Star Destroyer's famous appearance in the first shot of the movie.
When the squad leader tells the mother, "There's no crying in military engagements" he is paraphrasing Tom Hanks's famous line, "There's no crying in baseball."
The Doctor mentions meeting Jabe in this episode
Matt Smith talks about the upcoming Christmas special
A clip is shown