What kind of influence did the movies take in the 1920's?

I'm a bit unclear about your question. Do you mean, "What kind of influence did the movies MAKE in the 1920's?"

If this is your question, the movies of the 1920's served two main purposes. First some movies were pre-empted with news reels. These news reels where meant to educate people on current events. The actual movies were often for sheer entertainment. Critics of movies back then blamed producers for promoting and expanding the image and idea of the modern woman as flapper. Also, this was the time of pre-prohibition, and Dry groups (or supports of Temperance) argued that movies promoted drinking and other salacious activities.

Now if your question is about what influenced movies in the 1920's, a lot of movie ideas came from books, plays, and operas.