On the specific pleasure of rewatching Chinatown and knowing the ending.
The first viewing of Chinatown is a mystery film. You follow Jake Gittes, you piece together clues, you arrive at a conclusion. The ending is devastating because it refuses the genre's contract: the investigation doesn't restore order. It reveals that the disorder is the order.
The second viewing of Chinatown is a tragedy. Because you know where it ends, every scene reads differently. The moment when Evelyn Mulwray tells Jake something about Katharine — the moment that the first-time viewer files as ambiguous — is unambiguous on second viewing. Her behavior throughout reads completely differently when you know what she's protecting.
But what's genuinely remarkable about the second viewing is how much Jake doesn't see that the film shows you. The information is there in plain sight. Jake is too competent to notice it, which is the film's darkest joke: he's been solving the wrong problem all along, not because he's bad at his job but because the worst thing that could be true is the thing he never considers.
That's not a twist. That's a thesis.