Revealing mistake: Ms Babcock enters the house and stands by the small table You can see Maggie in the hallway behind her come out for her scene too early and duck back out of sight, and then quickly re-enter the scene just as the camera pans away. (00:07:20)
Revealing mistake: As Chloe Simpson is leaving the mansion at the end of the show, she trips over Fran's foot without touching her. She starts to trip about half a foot before Fran's shoe.
Revealing mistake: When Fran is on the private jet, the champagne sitting between her and Cathy doesn't move through all the turbulence, showing that it is the camera shaking and not the plane.
Revealing mistake: When Fran and Maxwell are changing the baby's diaper in the kitchen, the baby "pees", but the pee shoots from the baby's chest.
The Nanny Behind the Man - S2-E18
Revealing mistake: When C.C tells Niles "Stay on your toes" he supposedly steps on her toes but it is clear that he does not get anywhere near her toes before she cries out in pain.
The In-Law Who Came Forever - S6-E11
Revealing mistake: When Sylvia is cooking in the kitchen and greets Fran, her sleeve rests right under the frypan. If the heat was really on, the sleeve would have caught fire. (00:06:07)
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.