 CONT: In the final sequence on the rooftop between Deckard and  Batty, Batty releases a bird he is holding while it is raining. When  we cut to a shot of the bird flying away, the bird is not flying in  rain, the sky is cloudless. Director Scott admitted that when he  filmed the rooftop scene, he forgot to get a proper shot of the bird  flying and had to film it much later. Due to the rain effects  employed during the original shoot, the dove refused to fly (doves  do not fly in wet weather) to give the director his desired shot.  Consequently, the "dove