I have to agree with SM, as I had heard that Ripley was going to die in this film, but I had also suspected that it might not be so. After seeing in the cinema the "preview" that said that it was going to take place on Earth (and later learning it would not), I figured I would just disregard things I heard until I had actually watched the film. (Later, after hearing about the changes made before, during and after filming, I can see that the audience were not the only ones left in the dark as to what would happen!)