Factual error: In the show Gaius wears glasses, except eyeglasses first came into use in the late 13th century while the legend of King Arthur is around the 5th or 6th century.
Merlin (2008)
1 factual error in show generally - chronological order
Starring: John Hurt, Richard Wilson, Colin Morgan, Bradley James
Continuity mistake: All the castle windows on the outside of the castle are small squares yet from inside the rooms they're arched.
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