Makes me happy to read you'll be re-watching Mulholland.
Yes, too many Laura Dern reaction shots.
Steenburgen shows up briefly as a strung-out, indeed agitated woman who asks Nikki/Sue: "Do you know the man who lives here"?
Julia Ormond plays Doris "Chick with a screwdriver in her gut" Side.
Kinski shows up at the over-the-final-credits, end-of-film party scene.
Who is Michael Park?