So I'm on my 2nd playthrough because I was stuck on my first due to the difficulty.
I started playing a bit different, by attacking random things, collecting a lot more and just doing some things out of knowledge of what's gonna happen.

First thing I noticed, in the 'tutorial' (if it can be called that), in the room where Shadowheart's Alien-pod is, some parts of the scenery are destructable, which I thought could release shadowheart early, but it did nothing.
However!
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This thing is destructable too, if you throw bombs and such at it.
When it's destroyed, it leaves behind weird flying bits that just look buggy.

2nd.
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That guy (the tutorial boss that you are supposed to run past), is missing his tail and ... you can look inside the model through his backside. (lol)

3rd.
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Candle in the very first dungeon, in front of the sarcophagus in the secret room, that candle is not burning correctly.
Instead of a flame at the top, the entire sides are burning instead, as if it was some kind of wooden object or wall.

That's it for now, may add more in time.