I missed the drawing under the folding table in the kitchen. I also got stuck in Marcuria because I didn't notice that I could listen to the guards. I was literally wandering around for hours with my orb and drug in hand wondering why I couldn't do anything with the food on the table or the rats. I got obsessed with Kian's comment about owls and started trying to find an owl. Also, at the beginning of the chapter I thought I saw Crow, so I was looking for him. I went to get help but i I just happened to wander by the guards and noticed I could listen to them before anyone responded.
I really don't like these puzzles which involve searching for interactive objects, particularly when the environments are large and the number of objects is tiny. The puzzle in the warehouse was much better in my opinion. The things you could work with were easy to find and you could experiment and observe what happened. The only thing that I wondered about is whether there's any way to make use of the Kung Fu bot. Is there a different way to solve the puzzle? I used stealth, hauler and catcher.