Have you ever seen The Big Sleep?
I have, several times. I've taught the film to groups of very bright and talented students...
How do you think having to adhere to the Hays code affected the movie? 
Lots of innuendo. There's a certain art in saying things without directly saying things...
That is one of the positive things about Hays, it meant that filmmakers had to be more creative in getting around it. 
Right, subtlety and a structuring constraint. It relies on the shared knowledge and intelligence of viewers for understanding...
You mentioned teaching student about The Big Sleep. Do you run a film class or teach at a university? 
I taught in the creative writing department at a publicly financed conservatory for the arts for creative high school students. 
That sounds amazing! Maybe one of your students will be the next Howard Hawks or Raymond Chandler.
I have several students who have already achieved international recognition for their poetry, fiction, and translations.