Trivia: Right before the camera shows Kevin walk up to Mr. Duncan to pay for his things, it shows a man and his baby. The man is really Chris Columbus (the director of the movie) with his daughter (Eleanor Columbus) who later played Susan Bones in the first two Harry Potter movies.
Trivia: The Christmas ball scene is symbolic: since it is a masquerade party all the guests are in disguise. The only guests who aren't wearing masks are Bruce Wayne and Selina Kyle. This implies that their real personalities are Batman and Catwoman respectively, and that their public persona is the real disguise.