At the beginning of the 1980 film Coal Miner’s Daughter, there’s a scene where Tommy Lee Jones’s character drives a car up a steep hill. A coal miner named Herman looks on skeptically. Though it’s a speaking part, Herman isn’t listed in the film’s credits, nor is the part listed on IMDb.
Thanks for the prompt replies! It turns out I was wrong about the character’s name—Herman is actually one of Loretta’s brothers. (I was confused because just before he leaves in his first scene, a voice off-screen yells something like, “Come on, Herman, let’s go”. Turns out the voice was talking to another off-screen character.) And having rewatched the film just now, Sanderson does get billing before the credits roll.