In the part of the movie where Cage and Travolta are holding their guns to each other(in the beginning), Cage asks Travolta about his "Darling Janie" when the character's real name is "Jamie."

You can clearly hear that he says "Janie" but the closed-captioning says "Jamie." You know this is a slip-up because the character make the accidental mistake of calling her "Janie" to here face. The name thing was put in the movie on purpose.