If you recall... Sharon Tate had a yorkie named Sapirstein, that Frykowski accidently ran over and killed. It's a really strange name for a dog.
Word has it, Sharon named the dog after a character in the movie "Rosemary's Baby" (i.e., "Doctor Sapirstein" played by Ralph Bellamy). The screenplay for the movie, was written by Roman Polanski..
Come to find out... Joel Rostau had a crime partner named Harvey Sapperstein. Is it possible that Roman got the name "Sapperstein" (for his movie charcter) after meeting Rostau's crime partner?