The Day After Tomorrow (2004)

Continuity mistake: When Jack is briefing the President, he draws a line on a map of the U.S. and tells the President to have everybody south of that line evacuated. The shape of the line changes three times between shots. (01:04:20)

Sam Hall: Look, I got every question right on the final, and the only reason Mr. Spengler failed me is because I didn't write out the solutions.
Jack Hall: Why not?
Sam Hall: I do 'em in my head.
Jack Hall: Did you tell him that?
Sam Hall: I did. He said he didn't believe me. He said that if he couldn't do them in his head, then I must be cheating.
Jack Hall: Well, that's ridiculous! How can he fail you for being smarter than he is?
Sam Hall: That's what I said.
Jack Hall: You did? How did he take it?
Sam Hall: He flunked me, remember?

Trivia: The man who offers a 100 dollars to the bus driver to get on the bus is the same guy who is on MTV's Boiling Points, and hands out 100 dollars if you pass the test. (00:45:20)

Question: I noticed the librarian, Judith, never appears after the retrieval of penicillin, I say this because I missed a tid-bit of the film after they acquired it. Is she there just camera shy or did she freeze?