My grandpa was a stunt rider in this film
I haven't watched it yet, and it is quite likely that he's not recognizable anyway, but I do have copies of payroll records from the Warner Bros. archive that list him as a "stunt rider". Thanks again to the fine folks at IMDB for making it even more fun to indulge in my little family history research hobby. :)
Check out my grandpa!
http://www.imdb.com/name/nm0873865/