Conversation so far:
What happened under the production code of 1934?
The Production Code of 1934 imposed guidelines on the motion picture industry.
How were Betty Boop films affected by the production code of 1934?
No longer a carefree flapper from the date the code went into effect, Betty became a spinster housewife or a career girl who wore a fuller dress or skirt.

Question: What were the restrictions?
Self-contained rewrite: What were the restrictions under the production code of 1934?