I Love Lucy (1951) - 19 mistakes in entire show

Audio problem: In the "audience" in many different episodes over multiple seasons, you can hear a woman say "Uh oh," followed by short little laugh. It sounds exactly the same every time - obviously a sound effect.

Plot hole: In some episodes Lucy can not sing at all. In other episodes she can sing.

Revealing: When Ricky and Lucy are dancing in the living room, the camera swings too far to the left, and the edge of the set wall and the adjoining bedroom set can be seen briefly.

Other: In the scene where Ricky tries to get Lucy to have the drink that will put her to sleep, from the audience's point of view, Lucy is on the right side behind the living room table with the altered drink on the table in front of her. Ricky is to the left with the unaltered drink in front of him. While Ricky is repeating Lucy's spinning/clapping movement, Lucy switches the glasses around. When they are done dancing, Lucy ends up behind the table to the left, with the altered glass again in front of her. Ricky points to the wall and tells Lucy, "That is the biggest spider I have ever seen!" While Lucy is examining the wall, Ricky switches the glasses back around. The unaltered glass is now in front of Lucy. She then proceeds to drink while Ricky smiles at her plan's apparent "failure". If you have watched the glasses carefully, you will realize that Ricky is actually the one who ends up with the altered drink, not Lucy.

Visible crew/equipment: Just after Lucy does her ballet "audition" for Ricky, the microphone dips into the shot above their heads.

Revealing: In the last scene of the episode, just after Lucy pulls a gun out of the guitar case, you can see the living room table has been propped up on 4 blocks to make it taller.

Other: In the scene where Lucy supposedly stumbles on a few minutes before hand because she is drunk from the Vitameatavegamin, you can see a sliver from her living room in the backstage area.

Other: In this episode Lucy is trying to get Ricky to notice that their anniversary is on Monday the 19th by showing him a large calendar with the 19th circled. However, when they are in California and they celebrate their anniversary and Ricky asks for information to be wired to him, the telegram tells him that their anniversary is on the seventh.

Continuity: After everyone comes out of the judge's chambers, the door goes from open to shut repeatedly.

Visible crew/equipment: While Fred, Ethel and Ricky are doing their number the shadow of the boom mike can be seen on the wall with the curtains leading to the backstage area.

Continuity: In this episode, the Mertzes buy the Ricardo's old washing machine and say that theirs is old enough to be in the Smithsonian, yet just a few episodes earlier ("Sales Resistance") Fred tells Ethel to come and see her new Handy Dandy washing machine.

Visible crew/equipment: After take one of Ricky's screen test, when the director says to Lucy, "I thought it might add interest to the scene if you could make it go around and around like a lighthouse!", the Ricardo's kitchen cupboards are visible off stage to the left of the director's head.

Revealing: Look closely at the Ricardos' new Pontiac convertible. There is no glass within the windshield frame.

Visible crew/equipment: After driving all day, the Ricardos and Mertzes stop by a run-down diner that serves only stale cheese sandwiches, then end up there again only to spend the night in their one motel room. While they're all in their beds, the vibration of the nearby train causes the Ricardo's bed to shakily slide towards the Mertzes and then back again. The wire attached to the Ricardo's bed is visible.

Other: In this episode, Fred and Ethel claim that the bed they are sleeping in is just like the one they have been sleeping on for years. It is double bed with a big sag in the middle. However in an earlier episode "Vacation from Marriage" they show Lucy and Ethel in the the Mertz's bedroom and they have twin beds.

Continuity: Ethel's full name in this episode is Ethel Mae Potter; however in a earlier episode, Fred calls her Ethel Louise, and in another episode she is called Ethel Roberta.

Continuity: In this episode, Lucy goes out on the window ledge. In "Lucy Cries Wolf", the window ledge was very different: the walls were made of dark brick instead of concrete blocks, there was no downspout, and the ledge went into the corner and stopped, no continuation on the other wall.

Continuity: In the scene where Superman comes to Little Ricky's party Little Ricky has on a birthday hat. When Superman picks him up the hat is gone; it reappears when Superman gets ready to leave.

Continuity: In the episodes where Lucy and Ricky are getting ready to move to the country, there are shots in the Ricardos' bedroom that shows a wall on the right hand side of the room. In previous episodes, there was a window where the wall appears during the later 'moving to Connecticut' episodes.