Harder, Better, Faster, Browner - S2-E1
Continuity mistake: When Kenny gives Cleveland and Donna a thank you gift, he places the box on the edge of the table. The box moves back two inches without being touched as soon as the shot cuts. (00:07:05)
Continuity mistake: When Cleveland suggests Tim should take in Robert, the four beer bottles in front of them change position between shots. (00:10:00)
Another Bad Thanksgiving - S2-E7
Continuity mistake: When Cleveland reads Holt's twitter updates there is a leaf on the staircase banister behind him. In the next shot, the leaf has disappeared.
Continuity mistake: The amount of snow in the window keeps changing when Rallo first meets Murray.
Ain't Nothin' But Mutton Bustin' - S2-E10
Continuity mistake: The bullet hole in the Waterman Cable van at the start changes position between shots.
Continuity mistake: Cleveland Junior's pots and pans suit causes loads of damage to the kitchen. Yet as Donna walks into the kitchen, there is much less damage. (00:01:00)
To Live and Die in Va. - S2-E17
Continuity mistake: When Rallo tells his friends the farmer's daughter joke, the friend on the right is wearing white shoes. However when Rallo says "Oh man. Murray and his friends are so lucky their mamas are dead", the right friend is now wearing black shoes. (00:10:50)
To Live and Die in Va. - S2-E17
Continuity mistake: When Cleveland Junior tosses the cereal on the floor, the position of the cereal changes when Cleveland goes to put it under the fridge. (00:11:45)
The Essence of Cleveland - S2-E18
Continuity mistake: When Cleveland takes the tape out the camcorder, he starts writing. In the first shot, he's only just started writing, but in the next shot he is at least 70% of the way through writing. (00:12:00)
Continuity mistake: Cleveland goes outside in The Hurricane and gets blown all over the place. Yet reporter Dwayne Meighan is shown reporting the news outside in The Hurricane and is totally unaffected by it. (00:05:40 - 00:06:10)
Continuity mistake: Cleveland has glass in his feet, but later in the episode, the glass is no longer there.
Continuity mistake: After Cleveland shoots the bear and the Huey Lewis like guy, the gun vanishes when he runs to Donna.
Continuity mistake: When Cleveland pulls the gun off his back, he also pulls of a piece of his skin off as well. When Cleveland and Donna kiss, the wound has vanished.
Continuity mistake: When Cleveland tells Junior to ask out Whitney, the door handles on the lockers in the background are on the left side of the locker. A few moments later, the handles are now on the right. (00:02:10)
Continuity mistake: Junior isn't able to fit through the door after returning from Choni's Cantina (the first time). Yet Junior is able to fit through the door in other episodes. (00:04:15)
Continuity mistake: When Junior starts singing and Cecilia joins in making them a duet, the shot cuts to Cleveland. After this it cuts to a wide shot where we can see Cleveland doing nothing. In the next shot, he's suddenly finished drinking from a glass. (00:11:00)
There Goes El Neighborhood - S3-E9
Continuity mistake: When Junior and Cecilia are talking in the cafeteria, a boy with a blue waistcoat can be seen in the shots of Cecilia. The boy is eating a sandwich, and has a cup on the tray in front of him. In the shots of both Junior and Cecilia, the boy has no tray in front of him and is holding a milk carton instead of a sandwich. (00:08:45)
Continuity mistake: Ernie's position keeps changing in relation to Junior at the first election. (00:04:50)
Continuity mistake: When Cleveland walks into the kitchen after being gone for two days, Robert's plate is full of breakfast. A couple of shots later, Robert's plate is nearly empty without enough time to eat the food on the plate. (00:06:40)
Continuity mistake: When Cleveland notices the family and neighbours are there for his intervention, we can see Arianna and Holt standing right next to each other. In the next shot, Arianna is in visible but there's no sign of Holt. He was too close to Arianna to be out of frame. (00:09:35)
Answer: In the episode "A Rodent Like This" Rallo discovers that Cleveland Jr. is actually a secret agent who is tracking down Tim, who is actually criminal. Jr. reveals that in order to get close he had to eliminate the real Cleveland Jr. luckily Cleveland doesn't pay attention so it was easy. Whether or not this is canon or not depends on the writers.