Language is always evolving and english is definitely less formal, but I think the difference you see in those old movies has more to do with Acting style and training.
It used to be that actors started in the Theatre and were trained to "project" so that the back row could hear and understand the words just as well as the front. Seen close up in a film, it's not very natural but that's what audiences were used to.
Radio plays were another influence on early film and those actors had to exaggerate thier voices and emotions to help paint the scene.
It wasn't until the birth of "method" acting that a more natural style became dominant. It's what set apart Actors like Marlon Brando and James Dean. Directors also learned to to pull away their styles from the stagey influence of broadway and radio.
I'm no film historian so perhaps another member can fill out my theory better but I think that's the gist of it.
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Building an artificial intelligence that appreciates Mozart is easy. Building an A.I. that appreciates a theme restaurant is the real challenge - Kit Roebuck - Nine Planets Without Intelligent Life
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