One of the details to come out of the new material from HBO is a hint of what directors are doing. We’ve previously reported on the fact that Northern Irish director Brian Kirk was confirmed to be filming two of the episodes of the series. The behind-the-scenes twice show slates bearing Kirk’s name as director of the depicted scenes, with episodes #3 apparently featuring the Dothraki and Viserys sequences seen in the preview, and with episode #5 featuring Lady Catelyn in the Vale.
However, a recent report reveals that Kirk was involved in reshooting at least one scene from the pilot, originally directed by noted actor and director, Thomas McCarthy. Given the loss of the Doune Castle location as well as the recasting Catelyn Stark, it seems likely a very large portion of the scenes set in Winterfell will need to be reshot (much as the recasting of Daenerys and the move to Malta for filming Dothraki scenes likely means heavy reshooting there as well).
If Kirk is handling the reshoots in their entirety, rather than filling in for McCarthy for certain scenes, that would suggest he’s a lynchpin in determining the shooting style of the production.