- Bad Export for You: In Canada, the CBC which in 2007 was the official broadcaster of Doctor Who in that country chose not to air the special, skipping from Series 3 to Series 4 and leaving the cliffhanger at the end of Series 3 unresolved. Although it aired on a French-language branch of the CBC, it didn't get an official English-language broadcast until Space, a cable network, took over the broadcast rights to the series and finally gave the special a proper broadcast a half-decade after it first aired in the UK. In the meantime, Canadian fans had to rely on either DVD releases or illegal downloads to see it.
- First Appearance: Of Wilfred Mott.
- In Memoriam: To the show's very first producer Verity Lambert.
- Theme Tune: A new variant of the main theme again by Murray Gold is introduced with this story.
- What Could Have Been:
- David Jason was approached to play the role of Mr. Copper. Sadly, he proved unavailable. He'd probably have been more polite to the poor journalist interviewing the cast than Clive Swift was...
- Dennis Hopper was offered the role of Max Capricorn, but wasn't available.
- It was originally planned for the Judoon to return at the end to arrest Max.
- Originally, Max was seen to be a passenger on the Titanic in the ballroom during the episode's opening scenes. He was also not confined to a life support machine at this point.
- In his first draft of the episode, Buckingham Palace was destroyed by the Titanic. The Doctor stops the ship from crashing, but not before it smashes through the palace. In this version, instead of wishing the Doctor a Happy Christmas, the Queen is heard to curse the Doctor. This same early draft also featured a hoped-for cameo by Prince Charles. Davies spared the Palace as he felt it was too negative an ending for a holiday episode. Ironically, the alternate universe timeline created in the events of "Turn Left" showed that the Titanic would've hit Buckingham Palace without the Doctor around.
- Word of God: Russell T. Davies wrestled with how to make it clear that the rest of the Titanic's crew and passengers weren't just a bunch of humans. It was only after it was too late that he realised he should have made them talk about "the humans" (in the third person) more often.
- Working Title: Starship Titanic. It was changed when it was pointed out that Douglas Adams had created a video game and novel of that title, with an extremely similar concept, years earlier.
- You Look Familiar:
Trivia / Doctor Who 2007 CS "Voyage of the Damned"