- Bitterly denounced by Washington insiders angry at its allegations of corruption, yet banned by Fascist states in Europe who were afraid it showed that democracy works.
- To make his voice hoarse for the filibuster scene, 'James Stewart' dried out his throat with bicarbonate of soda.
- Originally, the ending was much, much longer, involving scenes such as Mr. Smith going back to his home state and given a parade (with Saunders), the Taylor machine being crushed, Mr. Smith on a motorcycle and stopping to see Senator Paine, forgiving him and everyone going to see Smith's mother. It was cut after a preview audience's response. Some of the footage can be seen in the theatrical trailer.
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