Buster Keaton crossed paths with Orson Welles in Venice, California (
The High Sign and
Touch of Evil), and with Alfred Hitchcock in San Francisco (
Day Dreams and
Vertigo). But Keaton also crossed paths with ‘King of Cool’ actor Steve McQueen filming stunts in the City by the Bay.

You can read more about this here -
https://silentlocations.wordpress.com/2017/04/09/buster-with-a-bullitt-keaton-and-steve-mcqueens-sf-stunts/Cheers, John