A lot of the mentions on the TV Tropes page are situations where the character thinks it is real but it is actually faked/staged. That's the opposite of The Man Who Knew Too Little.
More from Straight Dope:
Shadow of a Vampire - Everybody thinks they're just making Nosferatu but he's really a vampire.
Life is Beautiful - Roberto Benigni convinces his son that the concentration camp their in is a complex game.
My Name is Bruce - Bruce Campbell, action star, thinks he's on a lark.
In the thinks it is real but it isn't camp:
Last Action Hero
Bolt
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