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From what I can tell, it was definitely ad-libbed. What an amazing movie, and incredibly relevant to the idea of artificial life/artifical intelligence.

Yes I saw it in the extras I think of the Bluray. The interesting thing about the movie is that it changes the AI/androids to genetically engineered humans. I think the change was made part way through because it does not appear they changed all the references to them as "technology" or machines.