Audio problem: After Linda's head is possessed and bites Ash's hand, as he's getting up and going to the work shed, his mouth doesn't move as he says the word "work-shed", and it is obvious that it is dubbed in. (00:28:55)
Visible crew/equipment: When Ash crashes his car into the tree stump and is ejected through the windshield, you can see the wire attached to the dummy pulled through the windshield. (00:12:35)
Continuity mistake: When Ash is crawling through the cellar, he finds some of the pages, and he holds them in his right hand. Only problem is, he cut off his right hand earlier and attached the chainsaw to it - the film was flipped so he'd appear to be crawling in the right direction. (01:06:15)
Visible crew/equipment: When Ash is being sucked into the vortex at the end of the film, as he flies through the forest you can see the harness and wire attached to him, making him fly. (01:15:15)
Continuity mistake: No matter how many times Ash has blood poured on him or landed in mud, he will always have a clean face with his freshly made scars, scenes after he has been blood bathed or mud wrestled. (00:34:05)
Continuity mistake: When the hillbilly is killed by Henrietta, blood is spraying everywhere, and Annie is totally drenched by it, but in the next shot, she is totally clean except for the one blood stain mentioned on this mistake page. (01:03:30)
Continuity mistake: During the first scene where the "evil force" is chasing Ash through the house, you can see above the rafters, showing that this is not actually the house but a set. (00:12:50)
Revealing mistake: When the eye is flying toward Bobby Jo, you can see the rig holding the eye as it flies and the wire when it enters her mouth. (00:41:45)
Continuity mistake: After the hillbilly is killed by the Henrietta deadite Annie has a blood stain on her left shoulder. Then she runs into Evil Ash and it has switched to her right shoulder. (01:03:40)
Continuity mistake: When Ash is driving along in his car he has a muddy face, and he wipes some off with a rag, but still leaves a fair amount of dirt on. In the next shot when he gets out the car his face is spotless. (00:10:20)
Visible crew/equipment: When Annie pulls in the hillbilly guy after accidentally stabbing him with that ghoulish knife she pulls him into the cabin and you can see the knife bend like rubber against the door. (01:00:50)
Continuity mistake: When Ash is thrown into the cellar he breaks a few of the steps. Later when he goes in to retrieve the pages of the Necronomicon every step is intact. (00:38:30 - 01:08:10)
Continuity mistake: When Annie grabs Ash while he is lying on the floor you see lots of blood getting all over Annie's right shirt sleeve. Later on her shirt is totally clean. (00:36:20 - 00:37:30)
Revealing mistake: During the scene when the evil Henrietta flies up from the basement to attack the girl, while she is in the air you can see the wire holding her up, a split in the butt of the latex costume and as she turns to see Ash, sweat pours out her ear. (01:11:20)
Visible crew/equipment: Shortly before Bobby Jo is attacked by the tree, a tripod, hastily covered by foliage, is visible behind her. (00:52:20)
Visible crew/equipment: When Evil Ed is floating in the air screaming "dead by dawn" you can see the black wire attached to his back. (00:42:55)
Visible crew/equipment: When Ash is driving away from the evil force, as he drives through the forest a huge set of spotlights is visible in a tree. (00:10:10)
Revealing mistake: During the scene in the tool shed in which Ash mounts the chainsaw to his arm, you can see duct tape holding the chain bar on the chainsaw; this wouldn't exist if he'd just mounted a chainsaw onto his arm.
Continuity mistake: There are 5 different colours of blood used throughout the movie. Ash always gets soaked by blood (either chopping Linda's head up, or hacking Professor Noble to pieces), but always ends up dry in the next shot. [The reason why there are 5 types of blood: The creators wanted to get an R rating instead of NC-17, so they used different colors for slime instead of blood. It failed, they got an NC-17 rating and then released it independently with a non-rated rating.] (00:22:00 - 00:45:30)
Continuity mistake: After Ash hacks Evil Ed up, a lot of the green blood which sprays all over the walls disappears. (00:43:40)
Answer: Sam Rami could not get the footage of Evil Dead to use in the sequel, so he remade the movie in a shortened form for the beginning. Since Linda was the only original character other than Ash to come back he included her in the recap but deleted the others as not to waste time. An in universe answer could be that trauma of losing his friends made Ash block them out and rewrite history in his head, except for Linda who comes back to haunt him in the movie so he is forced to deal with it.