If they wanted something different from the previous three Darcys, then a nice, short a la Titus would have looked nice and nice on him.
Remember that during the early 20th Century, film studios were trying to make money and most films were shot in as little as 4 to 6 weeks, not months like they are now.
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In the novel and in every other adaptation , the Bennets are landowners.
The film tries to portray Barnum as this poor, unfortunate street urchin in love with a wealthy girl and somehow is able to marry her within the first ten minutes of the film.