Revealing mistake: In the part it shows Ash getting sucked into the time portal you can see the wire he is hanging from.
Continuity mistake: Ash has his shotgun stolen from him by the mini-Ashes who use to shoot at him. Ash then runs outside (all the while splitting into his good and bad halves) leaving his gun inside the windmill. Moments later Ash now has his shotgun again so he can blast Evil Ash in the face.
Visible crew/equipment: In the scene where the deadites are invading the drawbridge, a person gets slashed by a guy on a horse. When he falls, if you look quickly enough you can see the end of an airbag come up under the bridge.
Continuity mistake: When the witch falls the ground, playing possum, she is lying with her head away from Ash and Arthur, but when she jumps up, her head was where her legs were.
Continuity mistake: When Ash is in the pit, he grabs the chain that is moving that causes the spikes to come together. However, when he finally pulls himself up, the chain is attached to a spike in the ground. How was the chain moving?
Visible crew/equipment: In the scene where Ash first goes to the graveyard where the Necronomicon is said to be located, for the first second of the third shot of the camera "chasing" Ash, in the lower lefthand corner you can see the booted foot of the person carrying the camera.
Continuity mistake: When Ash is driving his modified car crushing skeletons and such, a skeleton jumps on the side of his car. Ash shoots him with his shotgun and A) the shot from the shotgun is it front of the skeleton (not hitting him), and B) when he says "Bye Bye", his mouth does not move.
Continuity mistake: At the beginning when the wise man says to King Arthur something along the lines of, 'I believe he is the one written off in the Necronomicon. He who has been prophesied to fall from the sky and deliver us from the terror of the deadites,' He is sitting on the horse to the right of King Arthur. When King Arthur says, 'What? Who? Likely he is one of Henry's men,' the wise man is now on the other side of Arthur.
Continuity mistake: Before Ash flies through the vortex, you will see that he does not have a watch on his left wrist. Later he has a watch on his left wrist after he passes through the vortex.
Continuity mistake: When Ash falls through the portal he has his gun, and after the King's men seize him it's knocked out of his hand. After the King draws his sword to challenge Ash to combat, Ash shoots the sword with his gun. How did he get it back so fast?
Continuity mistake: When Ash emerges from the Vortex, he falls on what looks like mats. When he coughs, the mats are gone.
Factual error: When all is back to normal and Ash is back at his job at S-Mart, a witch shows up and starts trashing the place. Ash is knocked behind the sporting goods counter, where there is (of course) a cabinet containing guns. Ash then jumps up and blows the witch away, firing 37 times. He's using a .38 caliber Winchester Model 1892 Saddle Ring Carbine with a "Trapper" loop lever. It only holds 9 rounds.
Deliberate mistake: Ash's car breaks out into the courtyard and the whirling, windmill thing batters the Deadites aside. We see the carnage a couple of times filmed from different angles, one Deadite, planted, legs apart, gets battered twice and the guys who come in from the left and are quickly jerked off screen are shown again seconds later.
Continuity mistake: Ash, Henry, and the other prisoners all have clean, non-sweaty faces and neatly combed hair after trekking across the hot, dusty lands in the "chain gang" line. This is particularly noticeable on Henry just after Ash demands that the prisoners be set free; even his little hair decoration is still in place.
Visible crew/equipment: Before Sheila gets captured by the winged demon, as it is flying, you can see the what looks like a smaller winged demon behind it which is the crane holding it up or a problem with the film.
Continuity mistake: In the shot where Arthur's men have just started the spiked walls moving in the pit, Ash looks at the walls intensely. In this shot, if you have the full screen version on, you can see that his chainsaw is attached to his hand. They use that same shot later on right before he charges over to climb the wall.
Visible crew/equipment: When the Army of Darkness marches towards the castle you can see a camera man in the bottom corner a few times. Widescreen version only.
Continuity mistake: In one of the scenes where Ash is fixing his new hand, specifically the scene where he is tightening the straps on his arm, you can see a big chunk of his hand past the wrist.
Revealing mistake: When Ash is in the pit and the Wise One tosses him his chainsaw, as the chainsaw is tumbling through the air the ripcord on it is always hanging down. Shouldn't it be flying all over the place?
Other mistake: Just after his 'If any of you primates even touches me' speech, Ash yells and then turns to shoot the pit monster. Only problem is, while he's yelling, Ash is turning to his right. But in the next shot, he's turned to his left.
Other mistake: When Ash is splitting into his two halves, he backs into a huge tree and it moves. The tree moves again a few minutes later when bad Ash is shot and flies into it.
Continuity mistake: Ash is chased by an evil entity to an abandoned windmill and only prevents it from getting him by barricading the door shut, yet when he smashes the mirror you can see the door behind him and it's wide open.