Near the beginning of the movie when the couples are having a get together there was a man who was doing "Rodan impersonations" - making screeching noises and moving about like the Japanese movie monster. He wasn't on screen for very long but I looked closely as it looked like Brion James. I checked the end cast credits and yes it was him in the role of Tony.
www.imdb.com/name/nm0001397/ BLADE RUNNER and the resultant fame was a few years in his future. I like seeing actors in bit roles before they became famous.