Funny enough, there is two discard piles on this picture.

Any other cases of changes made on cards between preview and print? Accidental or deliberate. At what stage is play testing done?

http://www.fantasyflightgames.com/edge_minisite.asp?eidm=129&enmi=The%20Lord%20of%20the%20Rings:%20The%20Card%20Game

Take a look at Gandalf on top of the page, here's the cost "6".

I must have a different image to you. Mine is the core set box art. I'm from Australia so that's a probably explanation.

Gandalf should have been 6 - he's significantly better than the 6 cost cards