What about Tyrell?
In one version, (I don't even remember where I saw it) Tyrell is revealed to be a replicant. When I asked Mr. Turkel about it, he remembered actually shooting a scene where he was killed by Batty and his head split open to reveal artifical parts.
Yet in most of the versions of the film he does not appear in any way to be a replicant...except for two clues:
1. He never allows Deckard to VK him.
2. He is at first startled by Batty's appearance. The attempted break-in should have warned him and later dialog reveals that Batty should have been expected. "He is too good of a chess player to reveal himself so early".
So, was Tyrell a replicant??