Raimi, Sam Easter Egg - Mine's Scarier Than Yours!

In the movie, Evil Dead, there's a shot of the basement of the cabin thry're in. On the rear wall is a poster for Wes Craven's film, The Hills Have Eyes, but the poster is torn in half. Sam Raimi put this there as if to say, " Hey Wes, your's was pretty scary, but check out the Evil Dead!"
In turn, in the scene from A Nightmare On Elm Street when Johnny Depp is eaten by his bed, he happens to be watching Evil Dead on his TV.
So in Evil Dead II, the poster is a Dream Warriors poster, and the battle continues.