Question: Why did Sam insist on going to the library? Laura suggests they should just go back to the apartment, and Sam says, "They have to get higher," but the library doesn't appear to be very high at all. At this point, none of them know about the freezing temperatures, so you can't even say that he knew there were loads of books to burn for heat.
Question: What happened to the woman talking about Sam's girlfriend's infection? When Dad arrives, she is not shown or in helicopter scenes.
Answer: If you mean Sheila McCarthy, she is on the helicopter. They show her smiling at the man who saved and carried the large Bible.
Answer: The woman was the librarian and library receptionist. She lives to die another day. She gets rescued with the other library survivors. The actress just isn't Jake Gyllenhaal or Dennis Quaid. So the focus in the end is not on her, but rather on the big-name stars.
ChristmasJonesfan