i was thinking of that one! "...then i defy you, stars" is a line taken directly from the play.
"How happy is the blameless vestal's lot!
The world forgetting, by the world forgot.
Eternal sunshine of the spotless mind!
Each pray'r accepted, and each wish resign'd;"
that is one verse from 'eloisa to abelard' by alexander pope. that verse is spoken by kirsten dunst's character in the movie. and, like someone else said, the line following the movie title line contains "wish resign", a song from circa survive's juturna. that whole album features a lot of themes related to the movie.
there's the whole connection between pink floyd's 'the dark side of the moon' and the wizard of oz. i don't know much about that one. pretty interesting though: http://en.wikipedia.org/wiki/Dark_Side_of_the_Rainbow
i'll try to think of more.