B:-3----3----3----2------------
G:-4----0----2----2----4----5--
D:-4----4----x----x----x----x--
A:-2----2----x----x----x----x--
D:-----------2----2----3----5--
I believe Dave plays the fist chord with the g string muted with his ring finger. Then when he plays the second chord he just raises his ring finger off the g string so its open. You can see this pretty clearly in storytellers.
E-----------------------------
B-3----3----3----2------------
G-x----0----2----2----4----5--
D-4----4----x----x----x----x--
A-2----2----x----x----x----x--
D-----------2----2----3----5--
Not that big of a deal. I just have always played it that way.
