Other mistake: When Sylvia is outside the Sheffield mansion she says "I wonder if my daughter Fran is at home? I will see if she is" the doorbell rings as soon as she finishes that line, but you can see both her hands are visible. She can't have rung the doorbell.
The Nanny (1993)
Episode list - season 4
Starring: Fran Drescher, Charles Shaughnessy, Daniel Davis, Lauren Lane
Genres: Comedy
More mistakes in The Nanny
C.C.: I feel like I have died and gone to heaven.
Niles: I have that dream, too, but you go in the other direction.
Trivia: At the end of the show, Fran and The Gym Teacher, played by Rita Moreno, are discussing Fran's high school boyfriend. Moreno's lines in the scene are from the song "A boy like that" that her character Anita sang in the 1961 movie West Side Story.
Question: What does she even do? The kids are too old for a nanny.
Answer: Mr. Sheffield needed someone to manage the kids, not necessarily babysit them. Brighton was a Bart Simpson type, Maggie was shy and awkward and Gracie had personality issues.