Episode #1.1 - S1-E1
Other mistake: Lord Grantham tells Violet that he wanted to put 'lights' in the bedrooms but Cora did not, but at the end of the episode just before he blows out his candle Cora turns and off camera turns off a light that "clicks."
Answer: Yes, because at the time it was not sure if it would continue and since it was short it could be seen as a miniseries. it also depends on where the producers decide to submit it. However since it continues on it is no longer a miniseries but a full series and thus cannot be submitted in the miniseries category anymore.
luke f