Anyways, apparently there are also hallucinatory mind-fuck things they do that are so incredibly subtle that I doubt if anyone noticed on their first playthrough. Throughout the game, there are billboards and banners that very clearly have Colonel Konrad's face on them, including one rather deliciously symbolic moment in a cutscene where all three characters are running across a scaffolding and they're silhouetted against the giant eyes of Konrad on a billboard behind them. The part where you get to the freeway and there's dead soldiers strung up and hanging from all the street lights, you can actually see the street lights from a good distance away from the freeway, and you can clearly see no bodies hanging from them, so they just magically appear when you reach the freeway. There's a tree at one point, that is covered with leaves and when you run past it, the leaves fall off and the tree rapidly withers and dies. You can only see this if you're looking behind you when you run away at that point. The mural that Konrad is painting in his penthouse depicts the mother and daughter you...encountered...earlier. And apparently if you look reeeeally closely at the walkie talkie you get that Konrad talks to you through, you can see a couple of wires sticking out of the back of it when he picks it up in the first cutscene. And that's not even mentioning watching all the cutscenes once you know the plot twist, and all the sudden your two squadmates giving each other worried looks and being reluctant to take orders from you takes on a whole new meaning.
And, something else they did that I appreciated was they changed the dialogue for giving squadmates orders, and the squadmates' response to your orders, as well as the melee kill animations as the game goes on. It starts out very professional, clean-cut, and military, and slowly gets more and more unhinged and barbaric as the story gets worse and worse.
Then there's this fuckin thing.