A couple of actresses to watch for...
When George is at "the shop", he heads back to a cabinet for some towels. Sitting below and to his right is the actress "Cynthia Wood" aka Cyndi Wood, Playboy Playmate for February 1973 and PMOY for 1974.
Later in the film, at the "wild" party, a woman is briefly seen walking through the room fully nude in body paint. This "Painted Lady" is Sharon Kelly, a nude model and adult actress in the '70s (SuperCherry in Russ Meyer's Supervixens) who later changed her name to Colleen Brennan and went on to appear in hundreds of adult videos in the '80s.