Because  you can’t ever get enough of a good thing here’s more–from the beautiful site, Cinephilia and Beyond–on The Long Goodbye:

I decided that we were going to call him Rip Van Marlowe, as if he’d been asleep for twenty years, had woken up and was wandering through this landscape of the early 1970s, but trying to invoke the morals of a previous era. I put him in that dark suit, white shirt and tie, while everyone else was smelling incense and smoking pot and going topless; everything was health food and exercise and cool. So we just satirized that whole time. And that’s why that line of Elliott’s—‘It’s OK with me’—became his key line throughout the film. —Robert Altman