Goofs

After Robin releases Marion form the box in the mines, she kicks it off the wagon. I the next shot, and following shots, it has reappeared. Until the last shot, when it vanishes.

Before John and Robin hang the sheriff. The three guards are stood as two and one. Then they are stood in a triangle without anyone moving.

Towards the end Friar Tuck puts four sacks over his shoulders, hanging freely. Two front and two back. In the far shot he is holding all four sacks with his hands on the back.

John has been labeled as a Moor. The Moors have historically been located in the Western Sahara, nowhere near the Holy Land in the time of the Crusades.

Robin and his bowmen are shown using their bows and arrows in the same manner as modern battlefield rifles. This is incorrect.

A bow and arrow is a standoff weapon, meaning that they would fire from out range of melee weapons or from concealment from opposing bowmen. They wouldn't stalk their opponents as they wouldn't be able to deploy their weapons quickly enough.

At 1:30 John is making some kind of fuel./explosive through distillation, using a liquid in a glass jar that appears to be about 2-3 gallons. First, the liquid is converted to vapor and then is coming out as a stream, instead of the small drip it would really be. The volume is also too high. When making drinking ethanol (drinking alcohol) you get about a 10% return--it's even less for something like methanol, which wasn't known until the 1600s.

There was no steel, steel plate (armored carriage), or even cast iron rails (mining cars) and structural steel until the 1800s, certainly nothing in the 1200s.

In the trailer we see Robin Hood shooting guards with his bow in the rain. In reality one can not use bows when the string is wet, as they loose elasticity. The bow is also a composite bow, meaning layers of wood held together by glue and string. Medieval glue would come undone in rain, rendering the bow utterly useless.

When Robin boasts about his skill with a bow he says "I can shoot two arrows a second", how would he know, clocks capable of measuring a second were not available for centuries later, and in that period the concept as accurate time was no known.

Robin receives a notice that he was being drafted for the Third Crusade.

The Crusades weren't numbered until AFTER they had taken place. And nobles were never "drafted". They were presented with the opportunity to join and they did so to fulfill their oath to God.

The set shows St. George's Cross in abundance (on site observation), which was only used in the British navy (during the reign of Prince/King John), and not adopted as a flag until a century later.

Nearing the 1hour 30minutes mark, the commoners are seen pulling up a railway line with metal rails, a technology advancement that wasn't invented until at least the 1750's.

Much of the weapon technology and clothing featured in the film does not match what was available in medieval England.

Around 1:30 as the insurrection is being organised, camera pans past a person wearing modern day spectacles.