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 Hood is fighting the sheriff's men under the tree, Robin throws a crossbow at one of the men. You can see the plexiglass, which is protecting the actor, get marked up and shake from the impact. (00:18:02)
Revealing mistake: When Robin gets attacked by Marian, Robin pushes her towards a stone wall several times, and the wall moves from the impacts.
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: 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. (00:11:27)
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.
Continuity mistake: In the big fight scene in the forest Robin is not wearing his necklace. But when he goes to help save Fanny before he swings across the necklace suddenly is around his neck. (01:39:40 - 01:40:25)
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.
Revealing mistake: The fallen tree from which Robin gives his inspirational speech about freedom has obviously had several branches removed with a chainsaw. It may be hard to see the marks of the blade on a copy of the video, but in the cinema they were pretty obvious.
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.
Deliberate mistake: Marian is wearing pantaloons, or knickers, in the rape scene. Knickers were not worn by women until Victorian times, and then they were split at the crotch.
Continuity mistake: During the hanging scene, when Bull cuts the rope to close the gate, he cuts it and runs so he doesn't get squashed by it, but in the zoomed out shot, he is suddenly on the ground and rolling away. (01:57:20)
Continuity mistake: Just before the 'one true weapon' speech, one of the villagers shows Robin what the soldiers did to his son, Will walks toward Robin and pulls his dagger from its scabbard, after Azeem says 'if it's fame you seek.' the camera goes back to Will and he is no longer carrying it. In the behind shots, it can be seen back inside its scabbard. (00:55:00)
Continuity mistake: In the scene where Will Scarlet goes back to Sherwood after being captured by Nottingham, Little John attacks him calling him a traitor. In one shot the cuts on Will's chest are going one direction in the next shot, they are going another.
Continuity mistake: When Robin and Azeem are escaping on horseback from the sheriff's men at Marian's castle, crossbows are being fired at them from the left side and one hits Robin's horse. When Robin pulls the crossbow bolt from his horse a minute later he pulls it from the horse's right side. (00:35:05 - 00:36:00)
Continuity mistake: This one takes place in the main battle scene in the forest. Robin holds a rope, swings around, knocks a man off his horse, and lands on the thatched roof. The next shot shows him shooting an arrow, but this time (and this time only) he's holding the bow left-handed, not right-handed.
Visible crew/equipment: Following the river duel the outlaws, Robin and his men sit around a campfire in the woods. There is a high-angle shot looking down on the men, also showing Little John perched in a tree. Look behind the tree, through the branches, and you can see a piece of camera tracking on the ground.
Continuity mistake: When Robin is testing the river before they cross, the rope that trips him is seen below the water looking bright yellow. But once out of the water, it looks brown with moss on it. (00:39:00)
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