 If you liked
Suzumiya Haruhi no Yuuutsu (2009)
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 ...then you might like
Ano Natsu de Matteru
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A group of friends decide to shoot a movie during summer break; the plot and characters in the movies on both series closely reflect the strange and secret truth about one or more characters or situations in the show even though it's not known by everyone participating in the creation of the film (On 'Haruhi' she's the only one who doesn't know the truth, on 'Ano Natsu De Matteru' most of the characters don't know).
That's just about where the similarities end as far as a can recall.