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.

These were pretty cool episodes and had me cracking up the whole way through them. The latest one called “the french mistake” was really cool to me and was a nice lesson on quantum physics. Supernatural Season 6 Episode 15
The French Mistake (see trailer above) was great fun. I was laughing the entire time. Can you imagine the number of inside jokes they must have had in there that just the cast / crew would get?
I’ve been surprised how much fun the show is. I’ll have to start watching it again. Did you see “Live Free or Twihard?”