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From the Wikipedia article, of the 13 depth cues, only 2 aren't properly present in 3D films - accommodation (having to focus the eyes) and peripheral vision - and the peripheral vision cue is also missing from regular cinema, TV etc.

So are there more things going on here? It seems unlikely to me that the focus of the eye lens is having a big impact.

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I don't know about the accommodation, but isn't the loss of peripheral vision like looking out of a window? Think of the movie screen as a big window into the world.

Not on the list (I think) but what about head movement of the viewer? If I move my head slightly to one side the picture stays the same while I expect to look behind an object.

Accommodation makes a big difference if you're near- or far-sighted.

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