Later in the film he finds an origami unicorn in his apartment, left by one of the designers of the replicants. The suggestion being that the designer built Deckard's dreams to be about unicorns. A bit too subtle for me
The origami unicorn is made and left by Gaff, the other cop, he makes several origami pieces during the film. It suggests that Gaff knows that Dekkard is in fact a replicant, and when he says "It's too bad she won't live; but then again, who does?" the suggestion is that Dekkard relizes that Gaff knows…something. Complicated, and straight over the heads of the US audiences, hence the different ending and talk over.