Lucy Is Jealous of Girl Singer - S1-E11
Corrected entry: At the opening, Lucy shushes Ethel to "be quiet, Ricky's sleeping," though she's vacuuming, and they start talking louder.
Lucy Thinks Ricky is Trying to Murder Her - S1-E1
Corrected entry: Halfway through the episode, Ricky is talking on the phone about props for that night's show at the club. You can hear both sides of the conversation. At the end of the call, Jerry on the other end says, "See you later, Des" to Ricky. He used Desi Arnez's real name instead of his character's.
Correction: He says 'dad', not 'Des'.
Lucy Thinks Ricky is Trying to Murder Her - S1-E1
Corrected entry: 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.
Correction: For years I also thought this was an error, but it's not. When Lucy first starts out with the "poisoned" cup, it's the one on the audience's right. After Lucy switches it once and Ricky switches it back, the cup on house right IS back in the same place, however Lucy wasn't drinking from that cup, but took the cup at house left (the "unpoisoned" cup) So the episode is correct.
Corrected entry: When Ricky puts a green light bulb in Lucy's room, it causes her to think she has turned green. When she looks at Ricky and Fred, they look green to her as well, but Ricky and Fred claim that they do not look green to each other, so Lucy believes that she's "looking at the world through green eyeballs." Ethel is not trying to deceive Lucy, but when she returns to the room she only comments on Lucy looking green. But she should also have seen that Ricky and Fred looked green, and thus been able to expose the ruse.
Correction: Since Ethel was not in on conning Lucy, Fred said to Ricky that Ethel was going to have to get the "Go-Bloos" too. Later, he made reference to Ethel being in bed sick with the "Go-Bloos".
The Ballet - S1-E19
Corrected entry: Just after Lucy does her ballet "audition" for Ricky, the microphone dips into the shot above their heads. (00:05:00)
Correction: No microphone can be seen dipping into view at the top of the screen in this scene.
Correction: That was the joke.