Ricky's Hawaiian Vacation - S3-E21
Visible crew/equipment: When Lucy rushes into Fred and Ethel's apartment to tell them that Freddie Fillmore had called, the actors' tape marks are visible on the floor. (00:12:40)

Starring: Lucille Ball, Desi Arnaz, Vivian Vance, William Frawley
Ricky's Hawaiian Vacation - S3-E21
Visible crew/equipment: When Lucy rushes into Fred and Ethel's apartment to tell them that Freddie Fillmore had called, the actors' tape marks are visible on the floor. (00:12:40)

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.
Lucy Wants New Furniture - S2-E28
Question: Lucy buys a 3 piece sofa set. One piece is an armless sofa chair. It is seen in the next episode but is never seen again. Where did it go?
Chosen answer: It's not known. She may have moved it to the spare room or it may be in a corner just off camera. There could be any number of reasons, though it probably took up too much room on the studio set, and it was removed, making it easier for the actors to move around.
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