Plot hole: If Carl is allergic to dead things, then why isn't he allergic to his dead fish Swimmy?
Suggested correction: Swimmy came back to life.
Other mistake: After Cindy says yes to Jimmy's proposal, he jumps with excitement until he realises what he did and screams "no" very loudly. Cindy is walking several feet away. How did she not hear him?
The Great Egg Heist/The Feud - S2-E9
Other mistake: In the Great Egg Heist, when they arrive at the museum, Jimmy gives everyone shishkabob-shaped earplugs for Libby's scream. But in the next shot, if you look at everyone's ears, there are no earplugs. Also, in the next shot, next to Libby you can see Carl putting his hands over his ears. This is impossible because the pointy ends of the earplugs would stab Carl's hands.
Continuity mistake: In the audience, Carl's parents are shown sitting in the second row behind Jimmy's and Cindy's parents. In some POV shots of the stage, however, they're still in the second row but are sitting behind Corky Shimatzu, who is sitting on the opposite side of the theater from Jimmy's and Cindy's parents.
Revealing mistake: Right after the scene with the witches, Cindy disguises herself while offering coffee to the producer Corky Shimatzu. However, besides the Groucho Marx glasses and nose, she is wearing her normal outfit when a few minutes earlier, she was wearing her witch outfit, had green makeup on her face, and her hair was a completely different style. Then a few minutes later, she goes back to her play costume. That makeup must have taken at least an hour and would take just as long to remove it. Yet she changes from and back to it in a matter of minutes.
Men at Work - S2-E15
Continuity mistake: In the end, Jimmy is trying to destroy that flying burger place. In one shot his computer shows that it has already destroyed pizza clown, but the next shot switches to the burger place, destroying pizza clown after it has already come on the computer as it being destroyed.
Suggested correction: Jimmy's computer could be predicting or tracking where McSpanky's was heading. Also, both instances could have occurred at the same time.