The Evil Dead franchise has had a history of issues relating to copyright and what can and can't be mentioned from previous movies. But Evil Dead Rise does have a very clear reference to Army of Darkness. In the audio heard on Danny's records, it is mentioned that the book Danny finds is one of three versions of the Book of the Dead. In Army of Darkness, Ash discovers three versions of the Necronomicon in a graveyard. Despite having a different appearance, Lee Cronin has hinted that the Necronomicon seen in Evil Dead Rise is the same book that flies around and bites Ash in Army of Darkness. That's why Cronin's book has teeth.