Corrected entry: During the religious service we see noblemen and women sitting on benches - benches were not introduced in churches until the 19th century.
Corrected entry: What's that 'arrow-cam' shot all about? Later on in the film Robin shoots at the hanging ropes and the arrow spins. This is correct for arrows travelling in a straight line. Its physically impossible for an arrow to weave and wobble in the way that the 'arrow-cam' shows and travel in a perfectly straight line.
Corrected entry: When Robin battles the Sheriff's men under the tree by the wall, he takes a crossbow from the horse and shoots one of the men in the stomach. Moments later after the battle the soldier can be seen with the arrow protruding from his head.
Corrected entry: In one scene we see Maid Marian weaving the Bayeaux Tapestry. The original tapestry is a Norman French document, made in Bayeaux France. In a time when the vast majority of the population was illiterate, the Tapestry's images were designed to tell the story of the conquest of England from the Norman perspective. Thus, Marian's weaving of it would make her a traitor.
Corrected entry: Towards the end of the film, Robin climbs on to the catapult, followed by Azeem, who moves his sword as though putting it in a sheath, but you can clearly see he either misses or there is no sheath, and so he just holds it there. When the two are catapulted in the next shot, both of Azeem's hands can be seen flailing and the sword can be seen fixed at his waist.
Corrected entry: Robin's sword bends when he presses it against Guy of Gisborne's throat.
Corrected entry: When Robin, Azeem, and Duncan are escaping Maid Marian's place and the soldiers, they come upon one of those rock walls. It is run down and sometimes is built up, sometimes is crumbled. They decide to crash through a built-up part instead of jumping over the crumbled section a couple of feet over.
Corrected entry: When Robin is attempting to rescue Marian from the chapel, he holds the scribe against the wall with his sword. You can clearly see the fake sword bending as too much pressure is applied against the Scribe's chest.
Corrected entry: When Marian is being chased by the Sheriff up the stairs, she's got a bare backside. Later, when he's trying to have his way with her, she's wearing bloomers.
Corrected entry: When the outlaws' hideout in Sherwood Forest is attacked 'by surprise' there are a large number of heavy catapults, which attack the hideout. Given the density of the forest and the size of the catapults, it probably would have taken over a week to get them in position.
Corrected entry: Freeman uses a retractable telescope, which wasn't invented until 1608. While lenses, etc. had been developed earlier and in different areas of the world, it is simply not possible that he would have a working telescope that early. See: http://es.rice.edu/ES/humsoc/Galileo/Things/telescope.html.
Corrected entry: Robin says that the last thing he said to his father was an argument about having a lover in the village (who was Will's mother). He later says that he was 6 years old when this happened. Taking into account the characters' (or at least actors') ages, Robin must have been on the crusades for a very long time and from an unusually young age.
Corrected entry: When Robin, Azeem, and Duncan are walking through Sherwood Forest, they hear noises and Azeem draws his sword. There's a distinct sound of metal on metal, like a straight sword would make being pulled out. But a Saracen sword can't be drawn out like that, since the tip is larger than the base. But if you look at Azeem's sword sheath, it appears to be exactly the shape and size of the sword. It would have to open up sideways or something to conceivably get the sword out.
Corrected entry: The mistake pretty much all Robin Hood films make is to have the Sheriff of Nottingham simply called 'Nottingham' by his friends/ peers. This would only be the case with the Earl or Lord of Nottingham who, coincidentally, would have lived in Nottingham Castle (since it would have been his family's). The Sheriff didn't live in Nottingham as his duties covered the whole shire ('shire-reeve'= 'Sheriff'). It'd be like confusing the Governor of California with the Mayor of Los Angeles.
Corrected entry: When Costner escapes after slashing Rickman's face, Rickman starts beating up the guard at the gate who let him get away. The shot is at right angles to Rickman throwing the last punch so we can see that his fist misses the guard's face by miles.