Trivia: As well as being allergic to glycerine, Sigourney Weaver was allergic to Jones. She didn't know that she was allergic to cats and thought that Ridley Scott might have her replaced, however he didn't mind as long as she didn't.
Suggested correction: Weaver was actually allergic to the combination of glycerine and the cat hair specifically. Once they stopped using glycerine, she was able to work with the cat without any trouble.