Most of what comeson a game disc is merely code that renders polygons, ai, etc. in the game. The only thing that takes up a lot of space is the textures that go on polygonal models, and the audio. However, games often use repeat textures and sound bytes, stuff like that, so they don't need that much on a disc.
Moves, however, are essentially thousands of 1080p images (and the sound that accompanies these images), each of which are unique. Games wouldn't need near that number of images (or textures, in a game's case), and they'd rarely be that large.
Imagine a ~2:00 hour movie, showing 24 1080p images a second. You'd need to save 172,800 1080x1920 on a single disc. That's a hell of a lot of space. Just look at the size of any of the pictures on your desktop for comparison.
Basically, a movie contains pre-set images. A game contains the code to render such images, which takes up far less space.
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