Rio De Janeiro
Theoretically, if you're unlucky, you could miss out entirely on the vision in the Crystal Cave clue. Also, if you don't take the disguises from the kitchen, you can't get the dining room clue. So you could get unlucky and miss out on the first two pieces of information.
Which is weird because then you could forfeit the chapter, since you won't be able to fulfill one of the victory conditions. (There are only 3 opportunities to get pieces of information and you need 2. If you miss out on the first two, you might as well forfeit...)
This is kind of silly, it almost forces you to get the disguise. You won't want to risk not getting the crystal tunnels clue because of bad luck, even though it's very unlikely.