Character mistake: Lucy says the source of the quote "To err is human" as Alexander Pope's "An Essay on Man." The quote actually originates from Pope's earlier work, "An Essay on Criticism."
Factual error: During the "University Challenge" competition: Brian answers a question with "Calcium Sulphite" and the question-master says he gave the correct answer of "Calcium Sulphate" (a different compound).
Brian Jackson: Ever since I can remember, I've wanted to be clever. Some people are born clever, same way some people are born beautiful. I'm not one of those people.