Answer:
The Evil Dead - uncredited as one of two hitchhikers (with a white shirt) who waves at the doomed friends as they drive to the cabin. He is also the voice of the evil force, and is a stand-in for Scottie's hand when he's about to pull the shower curtain, and for Shelley when they are driving up to the cabin.
Evil Dead II: Dead by Dawn - uncredited as the knight who says "Hail he who has come from the skies, to deliver us, from the terror, of the DEADITES!". He also voices the Henrietta head when it is on the ground screaming "ILL SWALLOW YOUR SOUL!" several times before Ash shoots it.
Army of Darkness - uncredited, when Duke Henry's men storm down the hill in the final battle, Raimi can be seen as one wearing a modern day brown sweatshirt and sneakers. I think he also voice's Evil Ash's skeleton, and a few others.
Spider-Man 2 - uncredited, a man who hits Parker in the head with his backpack
Probobly more