Characters' hairstyles, as well as the amount of blood on them, change drastically from shot to shot - a result of shooting the film sporadically over several years. Note that seconds after Ash is completely covered in Linda's blood, he is clean again.
In the cellar when the projector comes on, blood is dripping on the center of the lens in large circles. However, on the screen you see the blood oozing down from the top of the lens rather than dripping on the center.
When Scott and Ash go to the cellar and find the random objects, Ash starts to examine the Book of the Dead. When you look the book pages all the time in the different shots, they change even though Ash doesn't turn the pages.
At one point in the movie, Ash's feet are shown walking across a blood-covered floor. Near the end of the movie, his feet are shown walking down the steps to the cellar, and he is obviously wearing different shoes.
When Scotty is fighting with Shelly in front of the fireplace, Shelly is holding the Kandarian Dagger, however, when the shot cuts to Scotty trying to get his buck knife out of the sheath, you can see the Kandarian Dagger lying on the floor on the bottom right corner of the screen.
When Cheryl runs back onto the porch after being raped by the tree, there are three porch lights on the top of the cabin. One at each end and one directly above the door. As the "Evil" is approaching Cheryl, who is trying to unlock the door, the light above the door is missing. After Cheryl makes it back into the cabin, the "Evil" retreats back into the woods and suddenly the light above the door has mysteriously reappeared.
When the car was going across the bridge, the rear passenger side tire broke through, but when they drove it out the rear driver side of the car came up and the front passenger side dropped down. This is what would happen if the rear driver side tire had fallen through. In their case, the rear passenger side should have come up and the front driver side should have come down.
When Scott is walking into the bathroom to see if anyone is hiding in the bathtub, his hair is fairly long. He rips the shower curtain open and then spins around as the demon attacks him. As he's being attacked, it's quite obvious that he's recently had a haircut.
When Ash fires off the shotgun at the window, he fires off two shots instead of one before reloading. In the previous scene, he picks up TWO shotgun shells from the cellar to reload with: one he uses on the window and the other he pulls out of his shirt pocket in the next scene.
When Ash drags the possessed Linda outside, she is barefoot. A few minutes later, Linda appears back in the cabin and attacks Ash. Ash falls on the couch, and Linda jumps towards him. Ash kicks his feet up to push her away. If you look down at Linda's feet, she is wearing boots.
When Ash and Linda are admiring the necklace, you can see flecks of paint brush off onto Linda's hand. This is because the original necklace was gold and later spray painted silver; as the other silver one got lost during filming.
Near the end of the film, Ash heads back down into the cellar. The shot from the cellar looking up as he opens the door clearly shows brightly lit brown wooden paneling on the wall behind him as he falls down the stairs. A few minutes later, as Ash is climbing the stairs, the shot through the stairs themselves reveal shelves on the wall above his head as well as a light switch on the wall, not to mention the fact that there is now a ceiling several feet above his head that wasn't there before.
When Scotty kills Shelly with the axe, he cuts off her left hand. But through the rest of the scene you can see her left hand stretched out to him. After the killing, the hand is still on Shelly's arm but the arm is cut off.
When Ash has destroyed the enemies and comes out of the cabin, you can see first that the door closes slowly after it has been open, but after the camera shows a view of the forest and shows Ash again, you can see that the door has slightly gone open again.
In the end of the film when Ash has destroyed the enemies and leaves the cabin, you can see that the shapes of the holes on the door are completely different than before. You can also conclude from the shape of the holes that they were just sawed off.