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Apart from having 2 endings (Riku's and Sora's), there's not as far as I know. I've not heard anyone mention it so far either. So, I don't think there is.
It no have secret movies. Only after the credits appears Screenshots. After Sora ending appear Sora sleeping, and other thing. And After Riku ending appear Twilight Town, and then Appear BHK showing his face.
There's no secret movie for CoM. And no you don't get one if you complete Jiminy's Journal, KeybladeShadow88. I have done it. I have every card and have beaten both Sora's and Riku's Modes many times and you don't get a secret movie.