Deliberate mistake: In real life, Viking helmets didn't have horns on them, because it would be a liability in combat. The horns were actually for drinking. The Vikings in this episode were given horns anyway, because the writers didn't feel it was worth having to include an explanation of hornless helmets to a general audience.
Doctor Who (2005)
1 deliberate mistake in season 9
More mistakes in Doctor Who
The Doctor: I'm not... I'm not... I'm not from Mars!
More trivia for Doctor Who
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Chosen answer: No, no information is avalible for the identity of the entity.
Repo_Man
Season 2: The Well.
jakew25