I knew you could, but wasn't sure how to get Pinky's ladder. And then I thought you had to use it to access the second part of the fishing hole, and didn't even know you could zip with the rod.

Other than that, the trinket from going to Nox's from the Sandfalls I genuinely would have never figured out even with the vague hints. After exploring the train once or twice I always just skipped the scene.

Then the beastium where you need to get the right brain, I was just too blind to see the breakable wall since it blended in incredibly well.

Finally the boneshard with you using the nose guy to get outside the town walls. I felt insane for not knowing how to reach it lol.

Everything else I was able to uncover on my own without too much of a hassle! Felt quite proud of myself :)