Did Sullivan's Travels influence O Brother, Where Art Thou??

Yes. The film's title is a direct reference to this Preston Sturges movie, where the protagonist plans to make a film titled "O Brother, Where Art Thou?"

Did Sullivan's Travels influence Roman Holiday?

Yes. Directed by Preston Sturges, this film's theme of a privileged individual seeking to experience the life of the common people influenced the narrative of "Roman Holiday."

Sullivan's Travels (1941)

Name: Sullivan's Travels
Released: 1941

→ Influenced 2 films

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Films inspired by Sullivan's Travels

→ Sullivan's Travels influenced these (2)

O Brother, Where Art Thou? (2000)¹

Roman Holiday (1953)²

Featured Path

Sullivan's Travels → O Brother, Where Art Thou? → Inside Llewyn Davis

Sullivan's Travels

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O Brother, Where Art Thou?

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Inside Llewyn Davis

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Sources

Influenced

O Brother, Where Art Thou? (2000)
"The film's title is a direct reference to this Preston Sturges movie, where the protagonist plans to make a film titled "O Brother, Where Art Thou?"" O Brother%2C Where Art Thou Wikipedia
Roman Holiday (1953)
"Directed by Preston Sturges, this film's theme of a privileged individual seeking to experience the life of the common people influenced the narrative of "Roman Holiday."" Facts source

Sullivan's Travels (1941) has been cited as an influence on 2 later works, such as O Brother, Where Art Thou? and Roman Holiday. Check out the citations below.