Way before it happened? I only saw this movie for the first time not too long ago, and had no prior knowledge of it other than Brad Pitt was in it and that it involved an underground fight club. But I kinda figured out the twist roughly halfway through, maybe a little more. Or I correctly guessed the twist, more accurately.
Now don't get me wrong, I enjoyed the movie. I enjoyed Shutter Island a lot too, but I saw that ending coming a mile away. Just keep hearing how this movie is referenced a lot when discussing "blow your mind" twists and wanted to see how many others solved it before the reveal. Because I can say my friends we're hugely pissed I exclaimed what the reveal would be in the middle of the movie lol.
Probably not, but there are actually a lot of hints. There are a few frames early on of Tyler Durden - maybe half a dozen in the first 20 minutes. There are also a lot of lines that hint at it:
"I know this, because Tyler knows this"
"If you wake up in a different time, in a different place, could you wake up as a different person"
"Sometimes Tyler spoke for me"
"Is Tyler my bad dream or am I Tyler's?"
etc.
True, and in hindsight I'm annoyed that I missed some of the hints you listed. I had some suspicions pretty early in the movie, but I think the scene that really made my brain click was when Pitt would exit the kitchen just as Helena Bonham Carter entered, and the two weren't really seen with Ed Norton at the same time (at least then, kinda fuzzy if there were other scenes, been several months since I last saw it).