Trivia: Doctor Who 2010 CS "A Christmas Carol"
- Acting for Two:
- Old Kazran and Kazran's dad are both played by Michael Gambon. Leads to a heartbreaking moment when young Kazran calls his old self "dad?"
- Likewise, Young Benjamin, and the unnamed younger Pettigrew in the present are both played by Bailey Pepper.
- The Cast Showoff: Katherine Jenkins, better known for being a Glamorous Wartime Singer, plays Abigail. Of course she ends up singing.
- Development Gag: Eleven produces a picture of himself with Einstein towards the beginning of the special. Matt Smith wrote fanfiction about the Doctor meeting Einstein after being cast to prepare himself for the role.
- Genius Bonus: It's recently been discovered that great white sharks really can live at least 70 years, to judge by growth-ring patterns in a large male salvaged after its death.
- Hey, It's That Guy!: The Sardick father and son are both Dumbledore!
- Looks like Hamish hopped aboard a time machine, got a job as a pilot and dyed his hair to finally get over Alice's rejection.