Corrected entry: Allegedly Sam Raimi bought at least ten Oldsmobiles to be used as stunt cars for this film, however, he still drove his original Oldsmobile to the set everyday. When filming the scene where Ash and his car crash land in the dark ages, Bruce Campbell and a few technicians swapped Raimi's Oldsmobile for the stand in that was to be hoisted up and dropped. Raimi never noticed until he'd shot the scene twice then walked onto the set to check if the car was still in good enough condition for a third take. Amazingly enough, it was.
Corrected entry: When Ash is running from the evil presence, before it has overtaken him, he stumbles and falls a few times. At one time he jumps over a fallen log. When this happens, the camera (evil presence) breaks through a tree stump to come after him. If you watch in slow motion, or are very observant, you will see that there is a kabuki mask inside the stump. Must be some crew-members idea of a joke.
Corrected entry: During the castle scene, when the monster gets shot, he falls down and you can hear water splash, but you never see the guards open the spiked walls with the mechanism they use to start it up.
Corrected entry: After the army of the dead breaks through the main castle door, the humans rush to meet them. If you look carefully, there's an iron gate suspended above the two groups just before they clash. Why didn't the men drop the gate? It would have given them more time.