Where was Trial and Error filmed?
1997 film by Jonathan Lynn
Trial and Error (1997) was filmed in Independence and Inyo County Courthouse, 2 places named in its Wikipedia article's Production section, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's Production section
Wikipedia’s Production section names 2 places. Each links to the sentence that says so.
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Towns & cities
Independence
United States
County seat of Inyo County, California, United States
“Filming for Trial and Error occurred in Independence, California.” Wikipedia
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Landmarks & buildings
Inyo County Courthouse
United States
Historic courthouse in Independence, California