Sorry, despite all the good things you can say about Dick and his writing (including this story), this should never have made it to the big screen.
First of all, when Spencer Olham goes looking for the crashed ship, he does so to absolve himself, i. e., if he finds the crashed ship and the replicants inside it will prove he is not a replicant. He finds the ship, his wife's body inside - and his own, too - but suddenly this means their both replicants. So the replicants kill them, put their dead bodies in the ship and the dead bodies fly the ship and crash. Just plain stupid.
OK, we just accept that. But now we have a problem, because the replicants explode when they are close enough to their target to take it out. Why did Spencer Olham explode at that point? Was he close to anything he had not been close to numerous times before? If his target was the GeStaPo type, he would have exploded exactly when he was saying he had acquired his target during his silly interrogation scene (no, we don't know how to do catheder examinations anymore in 207x, or whatever it was).
I can tell you why Olham did not explode the first time he met his apparent target but you are not going to like it: we would not have had a movie because it would have ended after the first 30 minutes.
I think it would have been better that way ...
First of all, when Spencer Olham goes looking for the crashed ship, he does so to absolve himself, i. e., if he finds the crashed ship and the replicants inside it will prove he is not a replicant. He finds the ship, his wife's body inside - and his own, too - but suddenly this means their both replicants. So the replicants kill them, put their dead bodies in the ship and the dead bodies fly the ship and crash. Just plain stupid.
OK, we just accept that. But now we have a problem, because the replicants explode when they are close enough to their target to take it out. Why did Spencer Olham explode at that point? Was he close to anything he had not been close to numerous times before? If his target was the GeStaPo type, he would have exploded exactly when he was saying he had acquired his target during his silly interrogation scene (no, we don't know how to do catheder examinations anymore in 207x, or whatever it was).
I can tell you why Olham did not explode the first time he met his apparent target but you are not going to like it: we would not have had a movie because it would have ended after the first 30 minutes.
I think it would have been better that way ...