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: 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: 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: 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: 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: 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: 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: 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.
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. (00:30:10 - 00:31:45)