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There's only ever one world, it just changes on Dec 18th, and then changes back on Dec 18th (again). After the events of the movie the alternate world never existed (well, it existed for like 10 minutes while they fought Asakura).
However, Kyon's memories are unaffected by the changes, so he remembers things that didn't actually happen. In reality, he did fall down the stairs and was unconscious for a few days.
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