How are the extras packaged with this set? Are they just the same ones ripped from the Zork Anthology CD?

Anything you might be looking & more might be found here:

http://www.accardi-by-the-sea.org/

Hell, you can play all the Zork text adventures there too!

EDIT:
More Steve Meretzky games please GOG!

I haven't got Zork Anthology CD, but what's here in GOG's package:

1) Manuals for Zork Zero and Beyond Zork (strange, no manuals for other games) (PDF)
2) Additional documentation for all games except Planetfall (why?) - some of that goes as copy protection (no DRM, but you'll need info in this documentation to go through Zork0 and BeyondZork) (JPG)
3) Maps for all games except Zork Zero (PDF & JPG)

You can still freely download all the manuals (including additional documentation) you need from http://infodoc.plover.net/ (PDF, some are color, some are black and white) and http://gallery.guetech.org (large-sized JPG scans, full color)

So basically....stuff is missing, for no real reason. Why? GOG is supposed to be far better than this. When I saw Zork was getting a re-release on GOG, I was pretty excited because I was certain they would do their job and include all the necessary materials(or as close as they could get in a digital form). I'm pretty disappointed that, instead, they just phoned it in.

Once you've read one manual for an Infocom game, you've pretty much read them all. At least, in terms of the instructions you need to play. There is a lot of background material in the manuals that can help out a lot, though. I can see why it might not all get included, though -- the property rights to most of Infocom's material gets very convoluted, as it changed hands so often when the business went under.

So there are things we may never see again. I hope GOG gets more Infocom titles, but it's sad to miss the entire experience. They probably won't include the glow-in-the-dark stone from Enchanter, or the Peril Sensitive Sunglasses from Hitchhiker's Guide, either. *Sigh.* I guess digital distribution can only go so far...

Was there one in Enchanter also? I got one with Wishbringer, and that was the only Infocom game I ever had.

There wasn't any stone in Enchanter, only in Wishbringer.

I certainly wouldn't expect to see anything from GOG that isn't scannable (like the centipede from Lurking Horror) but anything that is should be here, even if it wasn't in the original 1994 anthology. I first owned Planetfall in another anthology and its stuff was all there (the Handbook feelie was full of great jokes, like the aptitude test that answered itself) and it hurts the release not to have them. Of course, you can find most of this stuff online these days but it's really something I expected from GOG. C'mon guys, get your heads in the game!

EDIT: I didn't have these Zork feelies, though. I guess my anthology was a reverse situation, huh?

I am revealed as a fraud. I hang my head in shame.

I'm also noticing that the map PDFs (all of them, it seems) "[contain] an invalid node." It's not hurting anything but the fact that they always show an error message is sloppy. Doesn't seem to matter how I extract them from their zips, just noting that because sometimes that is a factor. Anyone else getting this?