While playing i found a couple of things that I'm not sure are bugs or not but i felt like it was worth mentioning. Also i think some of these count as spoilers so yeah you've been warned.
When exploring the ruins with Triti their sprite isn't present (they are not following like Nii dose in the cave).
In the Mountain pass at one point you have to break a rock to get some shinnies but there is a way around it that i don't think is intentional, plus if you try to break the rock from the other side you become soft locked. (My guess is that the games tries to back the player up but cant because something might be blocking it. I'm not sure)
There are also two places were you can walk "out of bounds". There is one after the first rope in the cave and there's one off to the left in the secret island.
I have screen shots of all of these if it proves to be useful.
Hope this helps!