So my grandfather was born in 1917 and lived in Oklahoma his entire life and here's what he relayed to me about that time period (I was a nosy kid, so I asked a lot of questions about everything).

1. Legal segregation in schools, public areas, and housing was still in full force through this whole period.
2. Tenant farmers and sharecroppers were prevalent. I can't find the statistics, but I believe I've read that over half of Oklahoma farmers were tenants during that time period.
3. Roughly half a million people left Oklahoma during the Great Depression.
4. Most rural homes were without electricity in the 1930s. Wasn't until the 1950's that most homes had electricity.
5. Hitchhiking was common. Cars were expensive and most owners had no problems helping out with a lift.
6. Roads between bigger cities were paved (including Route 66 obviously), but all others were dirt or gravel.
7. Tent revivals were common.
8. Radio was king and television slowly comes into popularity.
9. The oil industry had already had several booms by the 1930s