Factual error: Dobermans were not introduced until the 1890s, let alone their ear cropping. (01:00:15)
Factual error: The Third Crusade is continually referred to as being in Arabia against the Arabs. In fact, it was in Palestine (then generally known in Europe as the Holy Land or Outremer) against the Ayyubids, who were mostly of Egyptian, North African and Syrian extraction. Although many would have been what we would today call Arabs, the term was not used for them then - they were generally known in the West as Saracens.
Continuity mistake: Friar Tuck has glasses while reading a paper. In the next shot, they've disappeared completely. Not in his hands, on the desk, or on his person.
Plot hole: Robin of Locksley is going round town with his black servant John with a metal hand (the only black person in the village it would appear too). John subsequently gets arrested later for being affiliated with Robin Hood. Despite him being not only the only black person the village but also the only one with a metal hand, the sheriff of Nottingham does not realise that Robin of Locksley is Robin Hood or even question why his servant is involved in the rebellion.
Suggested correction: While it's anachronistic, he's very definitely not the only Black person in Nottingham.
Character mistake: Marion tells Robin "he chose you for a reason", despite not previously knowing that Robin was The Hood. So she has no reason to know that John chose Robin.
