Factual error: Dobermans were not introduced until the 1890s, let alone their ear cropping. (01:00:15)
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.
Plot hole: Early in the film, Robin is wounded and he is immediately put on a boat back to England. When he arrives everyone in Nottingham thinks he died of his wounds. But how would they have heard that he was wounded when he was put on the first boat back to England?