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.
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.
Sam Raimi originally wanted to call the film The Medieval Dead, but Universal Studios refused. The title "Army of Darkness" was created by Irvin Shapiro, the uncredited producer of The Evil Dead and executive producer of Evil Dead II, who died two years before this film was made. Raimi then wanted to naturally give it the title Evil Dead 3: Army of Darkness, but the studio wanted the film to stand on its own from the rest of the series and the film was just titled Army of Darkness. The film was called Army of Darkness: The Medieval Dead for its UK release.
Embeth Davidtz had such a rough time shooting the fight scenes, filming at night and wearing heavy prosthetics, that she contemplated quitting acting. In a later interview, she acknowledged the hardships she had to endure, but said that over the years, she had come to enjoy all the positive comments she got from fans of the film.
During filming the Oldsmobile Delta 88 falling out of the sky was shot twice. During the first attempt, the 25-ton crane lifting the car failed due to mechanical problems and toppled over the edge of a cliff at the quarry location where filming was taking place. Fortunately, no injuries occurred because the crane operator jumped from the cab before the crane went over the edge. Days later a larger 80-ton crane was brought in to remove the damaged crane and re-shoot the car drop. In the final edit, elements of the re-shoot as well as footage from the end of Evil Dead II (1987) were used.
During filming of the climactic sword fight at Arthur's castle, Bruce Campbell suffered a small gash to his face when a decorative pin on his cape cut him during a stunt. He was immediately taken from the Polsa Rosa Ranch location to see a plastic surgeon to assess the damage. At the examination the doctor had to have the actual injury pointed out amid the myriad special effect scars and cuts Ash's character had accumulated during the story. Campbell was treated and returned to set shortly afterward to finish the scene.
One of the items visible in Ash's trunk is a copy of "Dark Horse Presents Fifth Anniversary Special," originally published in April 1991. This comic includes the very first installment of Frank Miller's 'Sin City.'
The film sat on the shelf for a year due to a feud between Universal Pictures and producer Dino De Laurentiis over the rights to the Hannibal Lecter character from the "Silence of the Lambs" series. The film was eventually recut by Universal after the feud was settled.
The film was infamous for having four different versions of the film (US theatrical, European, Director's and US TV). Each of them included deleted/extended scenes as well as scenes that were re-edited in a different order, depending on what version the viewer watched. The one that had the most restored scenes was the 90-minute US TV version. All of these versions have been compiled in a boxset that was released in both the US and Germany.
According to Sam Raimi in the book "The Evil Dead Companion" by Bill Warren, Charles Napier was to play Ash's boss in S-mart, but his role was totally cut. Likewise, Bridget Fonda was scheduled to have more screen time as Linda.
Contrary to popular belief, Ash does not say the words "Klaatu Barada Nikto" (a reputed homage to the film The Day The Earth Stood Still.) but a slight variant in which he pronounces the second word as "Verata." Apparently this is intentional as the wise man is also heard saying the words this way when instructing Ash on what to do to retrieve the necronomicon.
When Ash retrieves his Oldsmobile and opens the trunk, he takes out two books. One is a book on steam power and the other a Chemistry 101 textbook. The name shown as the author of the chemistry book was that of the father of a member of the prop crew.
Much of Army of Darkness was filmed with multiple cameras simultaneously rolling on both wide shots and closeups, rather than shooting first a master 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, 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.
The scene where Ash is thrown into the Pit and battles the two deadites was a combination of shots from two separate locations. The outside of the Pit, in the castle courtyard was shot at the Polsa Rosa Ranch in Acton California, while the interior of the Pit was shot in a set built on the back lot of Introvision Studios in Hollywood. The Introvision cave interior set consisted of a two foot deep pool that was built and flooded, and the cave walls and stalactites were built from pieces of wood lathe screwed together and covered with chicken wire, and sprayed with foam. The dreaded spikes on the moving walls were in reality open celled foam, painted to look like dark, rusty metal.
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.
Sam Raimi: [Oldsmobile] That 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.
The trivia items below may give away important plot points.
The original ending where Ash' attempts to return to his original time cause him to end up in a post-apocalyptic England was deemed too depressing by test audiences. Universal ordered a new ending, which involved a shoot out at the S-mart where Ash gets the babe. This version was shown in theaters, while a longer Director's Cut of the movie that included the 'bad ending' was released simultaneously. However, the TV series Ash vs Evil Dead (2015) continues the story of the theatrical version, which is therefore considered the canon version.
Ash screwing up the chant before taking the book of the dead was not the first time he tried to remember something someone told him. The previous case is during the dinner scene in the first evil dead as ash tries to quote something Scotty told him during their time as friends