Factual error: The Koh-i-Noor, as depicted in this episode, looks absolutely nothing like the real diamond. The episode's gemstone is about the size of the palm of the Doctor's hand, and shaped in a stereotypical brilliant cut. The real Koh-i-Noor is much smaller and oval-shaped.

Doctor Who (2005)
1 factual error in Tooth and Claw - chronological order
Continuity mistake: Before Martha uses Project Indigo she doesn't have an ear piece. A shot later when she says, "Bye, Jack", she does (and then takes it out). (00:17:56)
The Doctor: I'm not... I'm not... I'm not from Mars!
Rise of the Cybermen (1) - S2-E8
Trivia: Only eleven Cybermen costumes were built, but careful filming made it look as if there were more.
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Chosen answer: No, no information is avalible for the identity of the entity.
Repo_Man