The background music...
In some scenes the background music were sampled songs by Jean-Jacques Perrey.
Here is Pizzicato Polka
http://www.youtube.com/watch?v=_uyB83T9u9o&feature=email&email =comment_reply_received
The song at the credits was called "Boys and Girls".
http://www.youtube.com/watch?v=LNmTCkLqoVE&feature=watch_response
Notice something?