I read the spoilers for awhile and Walt did fly to Hawaii toward the end of shooting. I was expecting him to be in the finale, but he wasn't. Could be an extra for the DVD's or he could have been just making appearances for the finale. Emerson spoke about 12-14 minutes of video that took place after Hurley became #1 and before the finale, so that doesn't sound like something he's making up. Can't wait to see it!