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Evil Dead Rise confirms that the original trilogy takes place in the same universe as the remake and Evil Dead Rise. For one, they confirm there are three volumes of the Necronomicon, being the ones seen in Army of Darkness. The first Necronomicon, Necronomicon Ex-Mortis, was found by Prof. Knowby and read by Ash and his friends. The second book, Naturom Demonto, is the one Mia found in her family cabin and the final one, also named Naturom Demonto, is the one locked in the bank vault in Evil Dead Rise.

Each deadite in Evil Dead Rise has different eyes referencing the older ones. Ellie has unique silver eyes, Bridget and the neighbours have golden yellow eyes (like in the 2013 film) and Danny has pupilless white eyes (like in the original trilogy.)

The character names in Evil Dead (2013) start with letters that spell the word "DEMON" (David, Eric, Mia, Olivia and Natalie.)

Similarly, the building in Evil Dead Rise, the Monde, is an anagram for Demon as well.

A reocurring theme in the Evil Dead films, is a sister getting possessed and tormenting their sibling. This is shown with Cheryl and her brother Ash, Mia and her brother David, Ellie and her sister Beth and Bridget and her siblings Danny and Kassie.

All the characters in Evil Dead Rise are named after actors from the Evil Dead films, which I elaborate on here.

Originally Army of Darkness was named "Medieval Dead."

The original ending of Army of Darkness showed Ash waking up in a post-apocolyptic future, but it was changed to the more optimistic ending. Despite both Sam Raimi and Bruce Campbell preferring the original ending, the redone ending was used to continue the story with Ash VS Evil Dead.

The original ending was also supposed to lead into Evil Dead 4, where Ash would've fought deadites in the future with robots and other futuristic tropes, but because the ending was changed this never happened. Ironically, the same thing happened to Ash VS Evil Dead, when Season 3 ended on a cliffhanger so that the next season could be in the post-apocalyptic future, but this too was cancelled.

The German version of Army of Darkness incorporates both endings. It starts with the deleted ending, where Ash incorrectly takes 7 drops instead of 6, but as he sleeps it cuts to black and says Ash began dreaming over the centuries. Then it cuts to the regular ending where Ash is in the supermarket and is hailed as a hero before cutting back to him waking up in the post-apocalyptic future. Ironically this is my favourite ending, but it's not-canon.

Evil Dead (2013) had a bunch of different endings before settling on the, supposedly, canon one. One ending had Mia simply leave and the film ends, another had her go to leave before being jumped by a demon (like in The Evil Dead's ending), another had her collapse on the road and get rescued only to reveal she was still possessed and another had her go to leave but start floating before she exploded. The canon one is likely the theatrical ending where she simply walks away, and since we never see Mia again we have nothing to confirm or deny this.

The Abomination from Evil Dead (2013) is inspired by the poster of The Evil Dead, which depicts a woman being dragged into a grave. The Abomination even does the same pose when it rises.

Speaking of The Evil Dead posters, the promo images for The Evil Dead, showed Bruce Campbell and Bridget Hoffman being attacked by a skeleton prop, and defending themselves with a chainsaw. Despite being in all the promotional images and being on the literal cover, Bridget Hoffman was not in the film, though it's likely she is supposed to be a stand-in for Linda. She also played a cameo role as a sword fighter in Army of Darkness, and the voice of the Lori doll in Ash VS Evil Dead.

In The Evil Dead originally it was written that the characters would be smoking weed whilst listening to the tapes, perhaps as a way to explain why they would willingly play the tape, and as a way to rationalise the characters dumb decisions for the rest of the film. This however, was scrapped when the actors did smoke weed for the shot, but got too high and became uncontrollable.

The opening shot of The Evil Dead was filmed by Sam Raimi who stood on a boat, whilst Bruce Campbell pushed him along.

One of the demon passages in The Evil Dead translates to "Sam and Rob are the hikers on the road" a reference to the fact that the two hitchhikers at the start of the film are literally Sam Raimi and Rob Tapert.

During The Evil Dead, a cameraman slipped and dropped his camera onto Bruce Campbell's face, which caused several of his teeth to fall out.

Apparently during filming for Evil Dead 2, after one of the slapstick scenes Bruce Campbell heard somebody making funny noises above him and thought they were making fun of his performance, only for it to turn out that guy got electrocuted. I say apparently because even though Campbell said this himself, he could've been kidding.

Originally the idea with Evil Dead (2013) was that it would get a sequel, similar to Evil Dead 2 but with Mia, and then Ash's story would get a sequel with Army of Darkness 2, and then a third sequel would be made that would have Mia and Ash's stories merge and have the two characters meet, explaining the random after-credits scene in 2013. For some reason they never made the sequel to Evil Dead (2013) and the sequel to Army of Darkness was scrapped for Ash VS Evil Dead instead. The 2013 sequel was replaced with Evil Dead Rise, and Bruce Campbell has since retired as Ash in live-action.

In Japan, Army of Darkness is called "Captain Supermarket" probably being in reference to how Ash works in retail.

So far Evil Dead Rise is the only Evil Dead film without Ash's yellow delta, though apparently the chainsaw used by Beth is the same exact colour as the delta, being a double-reference.

Speaking of the delta, Ash's car appears in Evil Dead (2013), sitting abandoned in front of the cabin. It is most likely just an easter egg and has no lore implications.

Mia and David are half-siblings with different fathers. Originally it was intended for Mia to be Ash's daughter, but this was changed by Raimi. Ironically Ash did end up getting a daughter in the TV show.

Speaking of, Mia was supposed to appear in Ash VS Evil Dead, but it’s likely she wouldn’t have fit since her movie and experience was way darker than Ash’s, and she wouldn’t fit the tone.

The canonical reason Evil Dead (2013) is so similar to The Evil Dead is because the Necronomicon can cause history to repeat itself and likely lured the 5 friends to the cabin (which could also explain why some of the randoms are even here). This is why the 5 characters play very similar roles to the original film, Eric is Scotty, Natalie is Linda, Olivia is Shelly, and David is Ash whilst Mia is Cheryl. The reason Mia survives instead of David, and becomes more like Ash in the finale is likely that when David saved Mia, which Ash failed to do with Cheryl, the Necronomicon decided David should die and Mia should take Ash's role instead. It's also possible that David took the role of Annie in the finale, with him helping before being killed last second, but this is a bit of a stretch.

Bruce Campbell has two cameos in Evil Dead Rise. First is his voice being heard on the first tape Danny plays, where he plays a priest yelling “It’s called the Book of the Dead for a reason!” The second is simply the biting noises when Ellie bites Gabriel’s eye out, being Bruce Campbell furiously biting an apple.

Lee Cronin (Writer/Director of Evil Dead Rise) stated that Bruce Campbell’s cameo was intended to actually be Ash Williams himself. His reasoning was that Ash has found himself in the wrong time period a lot, and it would make sense for a time-displaced Ash to try and get rid of the Necronomicon in the past, before shit hits the fan.

Chet Kaminski was invited by Ash to go with them to the cabin. He chose not to come because Cheryl was also going and he didn’t want Ash to find out he was dating his sister as he feared it would end their friendship. This ultimately ended up saving his life.

In the Evil Dead films, the only characters to be possessed after they died were Scotty, Eric, David, Danny and the neighbours (Evil Dead Rise).

Shelly is never mentioned ever again after The Evil Dead. Scotty is mentioned once, in Ash VS Evil Dead.