This episode is a typical example. Instead of keeping the original dark and violent ending from Simak's short story, (Emmett kills the wrong Mr. James, then the surviving duplicate finds out on the phone that he only has a few minutes to live - thereby the title "Goodnight, Mr. James")
they make a much happier ending where the duplicate sadly dies as expected, but the original learns a life lesson and becomes a better man for it. No punishment for smuggling a deadly alien creature and nearly destroying the whole world, then illegally creating a duplicate, and getting his friend Emmett killed. No, instead he's rewarded. This completely ruined a work by a great writer.