The snapdragons let me go in Ep3 - but how do I get past the lock on the door to chessboard country? Looks like Graham dropped the key he had in Ep2...
Did you continue from a previous episode?
The door should not be locked, this is a bug. You will need to begin again and choose not to continue from episode 2. I believe the current builds have fixed this problem now.
Grab the patch here http://www.postudios.com/blog/forum/index.php?topic=10272.0 and it'll resolve the locked gate problem as well.