I finally signed up just to discuss this. Last night and this morning are the first chance I've gotten to play the demo, although I've seen several videos of others playing it. I've also been wondering how every little change will impact the game. I was quite surprised at how my playthroughs have panned out, as most of other people's I have seen had less variation. All the Sleazy Place demos I saw featured the same initial buildup, slightly different questioning, 10 minutes running out, and examples of "failed" and "passed" fight sequences. My first play of the scene, I think I asked Lauren about one question, she promptly burst into tears as she answered, I tried to console her with a hand on the shoulder and she told me to GTFO. That was a new one on me. Second run through I pissed her off enough I didn't even get to the questions. It's not like you get much out of her, Shelby says as much, but you have to wonder how that would affect anything further in the game. Even moreso than that, you can actually choose to abandon Lauren when Troy comes a-barging and just leave.
I also tried not to respond to the inhaler prompts but nothing seemed to happen.
As for the Crime Scene, the interesting thing I noted about that chapter was that the first time I played it, when Blake approached and asked if I wanted to leave I said yes. On second look, I realized that the game had prompted me to leave before I'd found all the evidence. Whilst fiddling around and getting to grips with the controls and such, not fully paying attention to all the dialogue, I think I on some level assumed that it was a hint I'd seen everything there was to see. Not quite. Like I said, interesting.
Obviously, I'm really keen on the game. I'm one of those who has been looking forward to the next QD title since since Fahrenheit came out. It's certainly not disappointing so far.