The next Supernatural episode goes meta: the Winchester boys get swapped to another reality where they play actors playing themselves. An article in E online says:
The episode, called “The French Mistake,” is a smart, self-aware farce reminiscent of the episodes where Sam and Dean became production assistants on the set of a genuinely haunted horror movie and the installment where the boys blipped into TV show universes, including a Grey’s Anatomy parody and a Japanese game show (wherein Sam was literally punched in the nuts). In this outing, dueling angels dump Sam and Dean onto the set of a TV show called Supernatural, which stars two lightweight actors named Jensen Ackles and Jared Padalecki, is shot in Vancouver (Dean, in a tone of the greatest aggravation: “Dude, we’re not even in America”) and is led by a grandfatherly figure named Bobby Singer. (Read more )
This sounds like a great episode, especially if the trailer is anything to judge by.