I also really enjoyed the lush backgrounds for all of the areas where the game takes place and all of the little animated details that were throughout each level. You might see a spider spinning down its web or a rat scurrying about, but they added a nice sense of depth to things. Although you are relegated to a small number of rooms and areas during your journey, each one was lovingly rendered and looks fantastic. Nice little details like scrawled words on a prison wall or hanging artwork in a room add to the experience, especially when you can click on them and get some additional info, however trivial it may be.
Lastly, when dialogue is going on between characters, a little picture will appear to the side with that person's head and their expression will match whatever they are saying. It's not animated, mind you, but reflective of the tone of the text. Just another little detail that shows Orchid Games went the extra mile for Royal Trouble: Hidden Adventures.