Risky Business was released in 1983. In one scene, a character notes how outrageous it was to spend four dollars for a cup of hot chocolate. I think most people would consider that a steep price even today, nearly 40 years later. Compare that to gas or grocery prices from movies of that era.
Are there any other examples of little details that haven’t aged all that badly?
The studio system is when the production of films was dominated by just a few large companies who usually made those films on their own lots. This is usually dated as being from the 1920s to the 1960s. They usually did their own distribution of the films. They usually had their actors under contracts: