Hello, could anyone tell me what the behind the scenes extra means? Is it a video or just a bunch of pics? Is it worth getting?

It's just a pack of eight photos from the game design works. Download it and see for yourself - it's only 2.5MB. :)

Em...I don't actually own the game here on GOG. :) I have the Steam version and I'm also planning to get the Fan Edition which comes with some goodies as well, although i'm not sure if these ones are included there.

Ah, I see. :)

So, extras for Machinarium, here on GOG, include:

- wallpapers: 8 wallpapers in 4 screen resolutions (1280x1024, 1600x1200, 1920x1080, 1920x1200) each;
- soundtrack: 14 .MP3s with music from the game;
- avatars: 8 avatars (150x150 px) cut-out from the game graphics;
- behind the scenes: see my post above;
- artworks: 22 pictures with artworks from the game;
- design sketches: 114 pictures with design sketches for the game.