> I don't know much about Samo Hung but as for Bruce Lee, What my teacher has told me is that Ji Han Jae, Hon Bong Sul, my teacher ( Lee Jung Bai ), and a few others trained Bruce Lee extensively.
I was told that it was primarily Hwang, In-Shik and Ji, Han Jae who taught Bruce Lee/Jackie Chan/Sammo Hung and others. You can see their film credits on IMDB. Hwang also did action directing in addition to training and performing.
http://us.imdb.com/Name?Ji,+Han+Jae
http://us.imdb.com/Name?Whang, Ing-Sik
I wasn't able to find any information linking Hon Bong Sul, Lee Jung Bai, or Kim, Jin Pal to the training that occured, or in any film credits in Jackie Chan/Bruce Lee movies from that period on IMDB. I don't know if the spelling of their name is variable, like Hwang In Shik's, so maybe I missed something.
I had a scanned magazine article that talked about the role of Ji Han Jae and Hwang In-Shik in those movies, and I don't remember any of the other people being mentioned. Other than Ji, Hwang and Choi Yong Sul, I don't remember seeing any other hapkido teachers in the pictures from that time. I will try to dig it up for you.
My teacher is Hwang In-Shik. There's a mention in the hapkido family tree page (
http://www.hapkido-info.net/html/hapkido_family_tree.html). It looks like someone put up a recent picture of him.
Let me know if you have more information about this matter, unravelling this aspect of history is pretty interesting.