When the first captive falls into the pit, a large splash of "blood" goes everywhere. But in the following shots, the blood is gone.
During the fight with the ghoul in the pit, the spiked walls move too fast and come close to crushing Ash multiple times, only to reset during changes in camera angle.
In the windmill one of the miniatures holds up a nail that Ash stands on, but the nail can clearly be seen in front of his foot.
Ash is momentarily dry after falling in the puddle before entering the windmill (the result of a cut scene).
The sun is rising when the reinforcements arrive, but soon after it is dark again (caused by re-editing the sequence, which was originally written differently).
In the final scene of the movie, Ash fires 34 rounds from a lever action carbine; A gun which has a maximum capacity of 15 rounds.
During the fight with the pit monsters, Ash fires his double-barrel shotgun 3 times without reloading, it could have only held two shells.
When Ash is lifted out of the pit by the chain, he barely escapes having his legs crushed by the rapidly closing spiked walls by kicking the monster hanging on to them off in the nick of time. However, this same monster, which should have been crushed, emerges from the pit soon after.
It would be impossible for an English speaker from 1992 to understand Middle English from 1300 AD, and the same for them understanding modern English. No one is speaking Middle English as they should be.
After Ash climbs out of the pit we see that the holster for his shotgun is empty. Then moments later Ash uses the shotgun to shoot Arthur's sword. But it's quite likely his rescuers retrieved the shotgun separately (and in the Director's Cut, you can see one of the locals handing it to him).
Some viewers believe they see Ash landing on mats when he falls through the portal,(which is too clearly seen to be a 'goof'), however on closer viewing they are, in fact, the *Large Paving stones* that led up to the cabin; There are 3 visible, yet Ash barely lands partly on only one. You can plainly see them because it's shown in slow-motion.
When Ash fights Evil Ash, his mechanical hand switches from his right to his left hand. Also in the same fight, it can be seen that Ash has both his hands at one point, even though his right hand should be the mechanical glove.
In the windmill, just before Ash steps on the nail, he suddenly has soot on his face. This is because of a deleted scene where he hits his head on the stove pipe, knocking it lose and pouring the soot in his face.
At the beginning of the movie Ash is being chain-ganged using a wooden stocks that bind his wrists and his neck, each through a separate hole. However, although his right hand had been self-amputated at the wrist, he seems unable to free his arm by simply pulling the stump out through the restraining cuff.
When Ash shoots Evil Ash in the face, Evil Ash jerks back before the shot fires and is actually in the air when the muzzle flash goes off. There is also a significant delay in the time between the click of the gun is heard and the blast.
When Ash straps Evil Ash to a table he revs his chainsaw. The chainsaw chain rotates in the wrong direction. All chainsaw chains travel in the direction that would pull the saw toward the tree when cutting with the underside of the bar (exiting on the top and returning in the bottom). It's a fundamental safety issue.
During the scene when the mini Ash dove into larger version of himself, the closed captions misspelled choking, instead it is spelled chocking.
About 29 minutes in, as Ash is being chased through the forest on his horse, you can see a black pickup truck in a three-second shot on the right of the screen as it follows Ash.
While in the windmill, Ash breaks a modern "back silvered" glass mirror, this type of mirror would not be invented until 1835. In the Middle Ages mirrors were made of highly polished silver or copper.
The metal rim around the pit was fastened with bolts which were not in existence
in 1300 AD. Also, the chains used are of a modern design, and the leg clamp
is welded - also not in use in 1300.
When Ash is gathering armour before constructing the mechanical hand, he takes a modern "drilling hammer" off the tool rack.
During the final battle a man (Sam Raimi) in a T-shirt and modern shoes charges in with Henry's army.
When Ash is fighting the hag after building his mechanical hand, he reloads his double-barreled shotgun and fires four rounds instead of two, and between each of these shots you can hear an audible re-cocking sound as you would from a pump-action shotgun. This sound would not be heard as there is no pump-action on a double-barreled shotgun.
At the beginning of the movie when Ash is being sucked into the portal, the cable that he is suspended from while spinning is visible.
Crew member visible behind grating in the pit sequence.
After Ash shoots Arthur's sword, you can see something on the side of the broken sword that faces Arthur's surprised face. It could have been the device that blew the sword apart, or something attached to the back of the sword that had to do with it being broken for the shot.
When the Book of the Dead is attacking Ash in the Graveyard scene, you can see the mechanism used to make the cover and pages flap (look for it when the book is attacking his neck, not while flying).
When Ash's car falls out of the sky, you can see the chains they used to suspend the car from a crane.
The film is set in Britain during the 14th century, possibly near London (based on the film's original ending). However, much of the movie is set in a dusty and rocky desert. Nowhere does a rocky, dusty, canyon-filled desert like depicted in the movie exist anywhere on the island of Great Britain, especially not near London.
When Ash insists that the people of the past honor their deal and send him back to his own time, neither he no anybody else considers that at this point, Ash's world cannot even exist in the future if the rise of the dead is not put down in the past. Ash has caused the rise of the dead in the past and thus altered the historical time-line.
During the Deadite siege, Ash dramatically orders the front gate barred. But the castle is equipped with both an outer and inner portcullis, which are specifically designed to frustrate would-be invaders. All the bar does is prevent their use.
Ash's mechanical hand is often clearly a cloth mitt, very noticeable in final scene.
When warming his hands in front of the fire in the windmill, Ash holds both of them to the fire, even though one is mechanical and would not feel the cold.