Bruce Campbell says that in order to make it appear that the chainsaw was always running, tobacco smoke was pumped through a tube that was slid up his right pant leg, up his shirt, and into the chainsaw.
In the original draft, Ash (Bruce Campbell) lost an eye. The original draft didn't go into medieval times until the second half, with the first half serving as a big-budget recap of both Evil Dead 1 and 2. We would've also seen more about Ash's personal life, such as him in college and working at S-Mart. The Raimis wrote the script this way because they didn't think Universal would fund a sequel to a low-budget indie film and instead planned to make it as a standalone partial remake, but were excited when they greenlit a straight-forward Evil Dead sequel and decided to scrap nearly anything involving the original cabin in the woods, besides a brief prologue.
During the scene where Ash is being pelted with rocks, fake rocks were used. However, to get a more realistic reaction out of Bruce Campbell (and partially as a prank), director Sam Raimi pelted him with potatoes. This cut was used. Raimi also told the special effects people to make the fight choreography as difficult as possible for Campbell ('Make him go through torture!'). Since he had to memorize his complex set of moves against invisible enemies that would later be added in post-production, Campbell would be "cussing and swearing" to keep up, and sometimes take thirty-seven takes to get it right.
An issue of the magazine "Fangoria" can be seen in the car's trunk. This was director Sam Raimi showing his gratitude for the publication's including the original The Evil Dead (1981) when it initially premiered.
Much of the film was shot with multiple cameras simultaneously rolling on both wide shots and close-ups, rather than shooting a master first and later a close-up. Because of this, the boom mic had to be kept back further from the subject than would usually produce acceptable audio. For this reason, Bruce Campbell often wore a wireless transmitter, with the microphone pickup concealed in the chainsaw pull-start hook on the strap that crossed his chest, and the transmitter tucked down inside the shotgun holster on his back. Campbell had to be assured that the black foam ball covering the microphone pickup would not be visible on camera.
Ted Raimi: at least four characters: The cowardly warrior who doesn't want to die (credited), the man who shouts "you can count on my steel", the swordsman with an eye-patch and the S-mart's store clerk.
William Lustig: known cult film director makes an appearance (credited as a "fake Shemp") as a supermarket customer.
Sam Raimi: [Oldsmobile] The beat-up Oldsmobile that goes through time with Ash belongs to director Sam Raimi. He included it in most of his early movies, each time more banged-up than the last. The items in the trunk of the Olds are not product placements; they're what Raimi actually had in his trunk.
Sam Raimi: [The Three Stooges] The skeletons do a classic routine. Ash calls Wiseman Joe "spinach chin", a line from Malice in the Palace (1949).
Sam Raimi: [POV shot] As various missiles such as catapult loads and arrows fly through the air, we see their targets from the missile's viewpoint.
Sam Raimi: [fake shemp] Among the listed "fake shemps" are Don Campbell and Charlie Campbell, brother and father of Bruce Campbell respectively (as knights, although Don is also a peasant in one scene), Sol Abrams (one of the knights), Josh Becker (peasant near the pit) as well as numerous people gathered for the S-Mart ending during a re-shoot, including directors William Lustig and Bernard Rose.