First printing can be discerned from the missing eastbound connection out of Serendib on the map. There is no known way to tell apart the first and second printing on the box exterior, but copies bought from 2010 forward should be of the second printing.

See http://www.boardgamegeek.com/filepage/46994/totan-2009-minor-errata-sticker-sheet for an easy fix.
Known errors: http://www.boardgamegeek.com/thread/435656/unofficial-errata-summary-for-tales-of-the-arabian
Official errata: http://www.zmangames.com/boardgames/files/arabian_nights/Tales%20FAQ%20v1.doc