Visible crew/equipment: While Lucy and Ethel are at their charm school, when they're standing in front of Miss Emerson's desk, in the widehots a small tape mark is visible on the floor in front of Lucy's feet. Then, when Lucy and Ethel are in sweatpants there are two small tape marks on the floor, and when Ethel walks to the other side of the room to join Lucy, there's another tape mark which Vivian even looks down at to confirm her foot's position.
I Love Lucy (1951)
1 visible crew/equipment mistake in The Charm School
Starring: Lucille Ball, Desi Arnaz, Vivian Vance, William Frawley
Revealing mistake: At the Brown Derby, when Lucy bumps into the waiter causing him to trip and spill the tray all over William Holden, we can see that the waiter's hand is taped to the bottom of the tray for the stunt to be done efficiently. (00:15:15)
Ethel Mertz: Rome wasn't built in a day.
Fred Mertz: Well, Rome wasn't built like you either.
Trivia: Fred and Ethel's bickering relationship didn't require much acting; in real life Vivian Vance and William Frawley didn't care for each other at all.
More questions & answers from I Love Lucy
Answer: There is no reason. It's a just a silly plot device, typical of the era. Women characters were often portrayed as making uninformed assumptions or decisions.
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