This is the fourth of five appearances Joanne Mariano makes in the series, each time appearing in the role of a teenager, but each time as a different character. Here the credits identify her as Ellen, but nowhere in the show is her name used or mentioned. She plays the young woman who comes out of Binky's hotel room just before Patty enters.
This is the second of 12 appearances Kitty Sullivan makes in the series as Sue Ellen. The character appears earlier in the season in The Tycoons (1964), but is played by Susan Tyrrell.