Astute analysis, and you've either seen or remembered more of the early Polanski than I have.
He made a name in the 60's when all critics looked to Europe first. I recall an ad tag line for "Repulsion": "Makes 'Psycho' Look Like a Sunday School Picnic." Whatever.
Cassavetes was a wonderfully surly husband to Farrow in "Rosemary's Baby." Robert Redford turned the part down (he would have been MORE horrifying), but Cassavetes, just off of "The Dirty Dozen," was scarily untrustworthy from Scene One.
Polanski, an Old School cinematic craftsman at heart, reportedly got into a raging argument with Cassavetes on set, finally accusing him: "You call yourself a director and you're not. You know nothing of art direction or costumes or acting. You just point a camera at people and let them improvise."
"Rosemary's Baby" was a huge hit in the almost-R-rated countercultural year of 1968 (it was a summer movie, the "R" rating emerged in November via MPAA edict.) Weirdly, I recall "Rosemary's Baby" getting a near-simultaneous opening with the other bit Paramount summer hit, "The Odd Couple" -- and they were kinda the same. Scary and depressing doings in creakingly old multi-room New York City apartments!
To me, the problem with "Rosemary's Baby" is that once you KNOW the solution (either hearing about it, or guessing it)...there is no movie. She's gonna have Satan's baby. That's it. We're way ahead of HER, for the whole movie. As Richard Sylbert said, "It's the Horror Movie With No Horror In It."
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Was Dance of the Vampires the original title of "The Fearless Vampire Killers Or Pardon Me But Your Teeth Are In My Neck?"
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Jon Finch was an interesting British actor with a great R-rolling Shakespearean voice and Johnny Depp's young looks. He got back-to-back auteur movies -- Polanski's "MacBeth" and Hitchcock's "Frenzy" -- and went nowhere as a star. His biggest second chance was in "Alien" (1979) where he had the John Hurt role of the guy the alien burst out of. But Finch got sick, Hurt replaced him, and the rest is history. Maybe we would have had Jon Finch in "Indiana Jones and the Kingdom of the Crystal Skull"...we have John Hurt there.
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"Chinatown' is a classic, indeed, for the CONFLUENCE of elements, on screen and off. Towne's once-in-a-lifetime (for him) original screenplay. Jack Nicholson (for whom Towne personally wrote the script) making the move from gritty indie man to "Romantic Movie Star" (but with a great big bandage on his gashed nose for most of the movie.) Faye Dunaway, perfectly cast for the first time since "Bonnie and Clyde." John Huston, perfectly cast, period.
"Chinatown" certainly fit that Nixon Resignation summer of 1974, and it fit the whole movie YEAR, in which paranoid conspiracies and downer endings were the norm: The Parallax View, Godfather II, The Conversation, The Towering Inferno, Lenny, and on and on. "Jaws," "Rocky" and "Star Wars" were birthed in 1974...as a backlash.
But "Chinatown" was also perfectly crafted, wittily written, gorgeously photographed, nicely acted...and perverse (the incest angle.)
Favorite scene: Nicholson confronts Huston near the pond, against a mouth-watering azure-purple sunset and with a great exchange (paraphrased from memory):
Nicholson: How much are you worth?
Huston: I have no idea.
Nicholson: 20 million?
Huston: Oh, my, at least that.
Nicholson: What more do you want? What can't you afford? What more could you possibly need to buy?
Huston: The FUTURE, Mr. Gitts!
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In his exile years, Polanski made a couple of notable European-made bombs with known American stars: Walter Matthau (in for Jack Nicholson) tanked with "Pirates," and then the Great Harrison Ford made the un-thrilling thriller "Frantic."
So Roman had some bombs to go with his hits....