These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Like You Would Really Do It: Layton gets turned into gold at the end of Chapter 3, and Maya is locked in a cage and plunged into the courtroom's fire at the end of chapter 4. Even if you haven't seen the trailers and know there's still far more for them to do later in the game, it doesn't take a genius to figure out they're not gone for good.
As another example, like Layton would really suddenly turn traitor/villain and prosecute Mahoney during the last trial for no reason. It's presented as a "shocking twist" cutscene, but it makes sense in context and there are very good reasons for the scene progressing the way it does.