Starring: Lucille Ball, Desi Arnaz, Vivian Vance, William Frawley
The Benefit - S1-E13
Visible crew/equipment: While Ricky and Fred are in the kitchen, when Ethel tells Lucy she needs her help getting Ricky for the club benefit, in the shots facing Lucy the shadow of crew/equipment movement is visible on the shutters to the right. (00:04:30)
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)
Lucy Ricardo: I made a funny?
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.
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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