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. (00:32:30 - 00:38:55)
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? (00:15:23)
Continuity mistake: The mini-Ashes dump a bucket on Ash's head. First the bucket comes down to his chin, then it covers his chin, then it comes down to his nose, then to his mouth, all in a rapid succession of shots. (00:33:40)
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. (00:21:16)
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. (00:04:30)
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. (00:02:40)
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? (00:04:45 - 00:17:45)
Continuity mistake: The mini-Ashes ram a fork into Ash's behind from the left. He stands up and pulls it out of the right side. (00:32:30)
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. (01:01:22)
Continuity mistake: When Ash emerges from the Vortex, he falls on what looks like mats. When he coughs, the mats are gone. (00:03:25)
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. (00:17:05)
Continuity mistake: Ash throws the fork at mini-Ash with the points vertical, but it flies and lands with the points horizontal. (00:32:55)
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.
Continuity mistake: When Ash confronts Bad Ash, Ash has his original right hand even though it should be replaced with a metal gauntlet.
Continuity mistake: When Ash is in the pit and the spiked walls start moving inwards, how far apart the walls are keeps changing but not in a logical order until he crawls out of the pit.
Continuity mistake: For the mini-Ash's only one is Bruce, all the others have fake chins on to make them looks like Bruce. (00:32:15)
Continuity mistake: In ED2 and Army they obviously had no real way to make it look like Ash was missing a hand so they obviously had him put his hand in a fist and put a bandage over it, long wrist, eh? (00:19:30)
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. (00:22:45)
Continuity mistake: After Evil Ash is killed and Sheila is knocked to the ground, there is a close-up of her beautifully made-up face and coifed hair. Then Ash helps her up and she is grimy and disheveled and sweaty again. (01:24:20)
Continuity mistake: Ash's hairstyle varies throughout the film. The scene where he get the Necronomicon is the most obvious because in that scene he has very bushy hair.
Answer: Towards the end of the film, when Ash mounts his horse and rides off into the sunset (before it then cuts to present day and he's back at the S-Mart), you can see his chainsaw is strapped to the horse's saddle. It seems that he either recovered it after the battle or perhaps he sent someone to the windmill to retrieve it.