It was amazing to see him in Twin Peaks: The Return. There’s one brief scene of him just strumming his guitar and singing outside of his character’s trailer and it’s legitimately one of the most moving scenes in the whole show.
I always liked Roger Ebert’s quote: “no movie featuring either Harry Dean Stanton or M. Emmet Walsh in a supporting role can be altogether bad.”
I haven’t come close to seeing all of Stanton’s films but the rule holds true as far as I can tell. My favorite roles of his include Wild at Heart, Inland Empire, and of course Alien.