Factual error: At the end, when the Doctor shows her companions the asteroid named for Rosa Parks, it's depicted in a dense asteroid field which looks absolutely nothing like the (very sparse) asteroid belt does in real life.
Visible crew/equipment: During the warehouse battle, around when the Doctor tells Donna, "Hold on, I'm coming", the film crew can be seen reflected in a door at the right of screen. (00:28:20)
The Doctor: I'm not... I'm not... I'm not from Mars!
Trivia: In "Human Nature", when John Smith (The Doctor's human identity) is talking about his parents, he says their names are Sydney and Verity. Sydney Newman was the creator of Doctor Who and Verity Lambert was the first producer. (00:30:00)
More questions & answers from Doctor Who
Chosen answer: No, no information is avalible for the identity of the entity.
Repo_Man
Season 2: The Well.
jakew25