Re: Castle Season 5 (including Spoilers)
Priroities. Covert Affairs HAS to go to other countries, or the show doesn't work. So they work the budget appropriately. Actors sign on for it, several episodes or even a season is there, etc.
For Castle, it's a novelty gimmick. Would cost a lot to move the whole production there for just part of an episode or so, so easier to just fake it.
Perhaps, if I am very lucky, the feeble efforts of my lifetime will someday be noticed and maybe, in some small way, they will be acknowledged as the greatest works of genius ever created by man. ~Jack Handey