Slavoj Zizek is a Marxist/Lacanian psychoanalyst. His psychoanalytic observations of Cinema is very interesting and different. In this video he briefly talks about Casablanca, one of those mediocre Hollywood hits that to my opinion has been over-rated. He also approaches the Post-Code Hollywood censorship, on the level of its subconscious affect.
I really encourage you to check other Zizek videos on youtube. There are two full length features also called: the reality of the virtual and Zizek, that are really interesting.