I came across these sites while looking for Christmas movie trivia for my Dec. 20 Tribune article on Christmas sites. ESLnotes.com uses It's a Wonderful Life and other movies to teach English idioms and expressions:
http://www.eslnotes.com/movies/html/its-a-wonderful-life.html
(I recently clipped an NYT article about Seneca Falls, presumably the real-life Bedford Falls: click here)
This site culls enough stacks of TV and movie trivia from IMDB to kill four lunch breaks:
http://www.faqs.org/faqs/movies/trivia-faq