Continuity mistake: When Robin heroically swings across to Fanny and the child in the Sherwood Forest battle scene: He swings straight across, with the rope's focal point fixed between himself and Fanny. Then he gives the rope to Fanny to swing across to John. This time the focal point is between her and John. Someone somehow managed to "move" the rope in order to move the plot along. That was jolly nice of them wasn't it?
Factual error: When Azeem goes to pray he starts by kneeling on the ground and soon afterwards he bows down. The Muslim prayer sequence starts by standing up for quite some time then one bow, up again followed by two kneeling bows then up again. Also, Muslims do not put their palms together for prayer as Azeem does, rather their hands are either at their side or crossed.
Revealing mistake: When Robin crashes through the stained glass window to save Marian and fight the sheriff, the panes of glass flutter in the breeze, revealing it to be fake glass.
Continuity mistake: When Azeem first blows something up, the Friar is next to him and Will, Robin, John and Bull are seen behind them around the model of the castle. However when it goes to the next shot there's only Will and Robin around the model. John and Bull walk in a few seconds later.
Visible crew/equipment: When they are moving the catapult, if you look above Robin and Azeem, you can see a crew member in the window above them. He is wearing all black, but you can tell he is trying to get out of the shot.
Continuity mistake: When Robin goes to the Church, the camera pans down from an enormously high vaulted ceiling in a vast cathedral. A few moments later, Robin and the Sheriff come running out of the Church and it's a small little stone shack.
Visible crew/equipment: When the men are pushing the catapult to the gate look at the far left of the screen for a few seconds you can see a crew member in a baseball cap and then a large movie camera. There's also a twig palisade next to him where two more crew members are visible.
Revealing mistake: When Friar Tuck hits his head on an over-hanging branch whilst on his cart, it is really obvious his head comes into contact much earlier than the added sound effect and his eventual reaction would suggest. Plus the branch bends and flexes backwards an awful lot - it's not resistant enough to knock someone out as depicted.
Continuity mistake: At the execution scene where Will Scarlet is about to be beheaded, Robin picks up a burning arrow to shoot the executioner. When the arrow is first picked up from a dead body, the flame is half-way up the arrow, but when Robin fires it, the flame is (conveniently) at the arrow's tip.
Continuity mistake: When Robin first goes to visit Marian, he enters the house with a roll on his back (over the shoulder). It's there when he enters and the maid tells him to 'stand right here'. A moment later "Marian" appears, and the roll is gone, it's not on his back, or even in a wide shot showing he took it off. It never appears again.
Continuity mistake: Throughout most of the film, Robin wears brown boots with metal studs around the calf. When he is fighting the Sheriff of Nottingham at the end, he is suddenly wearing greyish boots, with cross-garters. Since you see his brown boots just before he enters the castle - when he kneels down near the dung they're especially visible - it is rather ludicrous that he would suddenly change them, given that he is rushing around trying to save the other outlaws, and then Marian.
Continuity mistake: When Marian and Duncan leave the camp by boat, Marian's lady-in-waiting, Sarah, is nowhere to be seen. Surely she should have left with Marian, as she is with Marian later in the chapel.
Revealing mistake: When Robin gets attacked by Marian, Robin pushes her towards a stone wall several times, and the wall moves from the impacts.
Continuity mistake: This mistake makes sense only if you've seen the extended edition. In a deleted scene, it is understood that the sheriff cuts out his scribe's tongue. In a later deleted scene, the scribe has to write messages on a chalkboard to communicate. Later still, at the end when Robin and company invade the castle, Robin asks the same scribe where the sheriff is and he verbally tells him, "Up the stairs," or something similar. Maybe he could speak a little, but he wouldn't have been able to pronounce the letter 'T'.
Continuity mistake: When Robin and Azeem are approaching Dover Beach, there is shot behind the boat showing only one sailor standing at the stern. In the very next shot, not only is the sailor standing but suddenly so is Robin, at the bow.
Continuity mistake: When Robin is challenged by John Little after attempting to cross the river watch Johns staff. The scene cuts between shots from in front of and behind John. All shots from in front of him show him leaning closely on the staff, all shots from behind show him holding it to side and not leaning on it.
Continuity mistake: When Robin is talking to the Bishop about his Father, they are in a small chamber in the Church. Later on in the film, when the castle is being stormed, Friar Tuck enters this room and throws the Bishop out of the window. Only this time the exact same room is in the castle, not the Church.
Factual error: Think of the '100 billion dollars' scene in Austin Powers 2, where the President laughs because that kind of money doesn't even exist. You now have an idea how ridiculous it is that a twelfth century outlaw stealing tax money and robbing travellers could get anything like '4 million' as the scribe mentions. King Richard's ransom was only something like 100,000.
Continuity mistake: Guy of Gisbourne's men come upon two of Robin Hood's men in the forest, trying to pull a log onto the path. The men see their enemies and run away, leaving the log sticking out onto the path. But the log suddenly disappears when Gisbourne's men go after them, and never again reappears.
Continuity mistake: When Will tells the sheriff he'll have to "respectfully decline" his execution, from one angle his hands are behind him holding onto the gallows, but from another angle they're outstretched.
Chosen answer: The masked men weren't part of a cult, they were the Sheriff's soldiers, the same ones that Robin meets when he first returns home. They are just in hoods and masks to appear intimidating while trying to kill the noblemen, like Locksley.
Bishop73