Rosemary's Baby Easter Egg - Playboy Playmate In-Joke

In a scene near the beginning of the film, Mia Farrow (Rosemary) meets another young woman who lives in her apartment building. Farrow tells the other woman that at first she mistook her for the actress Victoria Vetri. The woman says that people tell her that all the time, and then she introduces herself as Terry Gionoffrio.

This is actually a little in-joke, because the woman who plays Terry Gionoffrio really IS Victoria Vetri. However, in the credits, she is listed as Angela Dorian, which was the name she used when she posed in Playboy, where she was the 1968 Playmate of the Year.