The big feature of v3, is the addition of Game Boy Printer functionality!
From different spots throughout the game, you can now print scenes when inspecting certain elements. There are more than 30 in total.

Of course you need to either have a Game Boy Printer connected, or use an emulator with such a function.
For example 'Same Boy'-emulator fakes this by exporting the image so you can save the image to your computer.