Watched
The Day of the Locust (1975) and found some iffy parallels to MD. The film is based on a novel of the same name, the story is set in Hollywood in the late 1930 where aspiring actors and filmmakers struggle to make a living. No spoilers ahead:
The film pays homage to classics like Chinatown and Sunset Blvd., e.g. here the Paramount gate scene:
A visit is being paid to the site of the Hollywood sign and we hear a tour guide recounting the tragic events
surrounding Peg Entwistle's suicide leap in 1932. To my surprise the guide has her name as Camille McRae (no google results), a funny connotation from our POV. And, if I am not mistaken, that's Mulholland Drive in the background.
The protagonists live at an apartment complex called San Berdoo (officially San Bernardino Arms) which looks and sounds much like Sierra Bonita in MD. The heroin is a blond wanna-be actress with only bit parts under her belt, but daydreaming of making it big. Like Camilla in MD she knows how to play people (the hero mostly).
Donald Sutherland's kitchen looks familiar too. Here's a fun fact: The name of Sutherland's character is Homer Simpson (as in the novel of 1938), which had me

the first time I heard it. Apparently, this was coincidental and had no bearing with Matt Groening's choice for his cartoon character.