Apparently this was Sly Stallone's first role. It's uncredited, but you can clearly see that it's him in the picture I took. This would have been a full five years before he played "Stud" in the 1970 masterpiece The Party at Kitty and Stud's. Coincidentally (perhaps!), the subtitle about five seconds after this shot has a character saying, "Give it to me, Stud. Give it all to me. Go ahead, Stud, give me all your juice," just like Kitty in that first Stallone credited role.
Here I am enjoying snacks and watching Samurai Spy: