Continuity mistake: An ace is thrown on a ten of diamonds. The position of the ace changes between shots. (00:04:55)
Continuity mistake: When Cleveland says "They do say you're supposed to chase your bets", Slim Biggins on the Club Nugget casino card has his hands raised. In the next shot, his hands are by his side. (00:07:20)
Continuity mistake: When Cleveland sits down after betting the college fund, the drink next to him changes position between shots. (00:07:35)
Continuity mistake: When Cleveland begins to faint after losing the college fund, the Jack of Diamonds, the two of hearts and the ten of diamonds on the table disappear. (00:07:50)
Deliberate mistake: The same outside shot of the Big Nugget Riverboat Casino is used over and over just zoomed in or zoomed out. Notice how the exact same cars are in the exact same place each time. (00:08:05 - 00:10:25)
Continuity mistake: When Cleveland walks back into the house, his foot hits a dumbbell and throws his shoes to the left of screen. The shoes disappear when he accidentally knocks down the drums. (00:09:10)
Continuity mistake: Nothing is on the couch (except for a cushion) when Cleveland creeps into the house. A remote suddenly appears on the couch a few seconds later. (00:09:15)
Other mistake: Cleveland spent several seconds trying to turn off the TV repeatedly pushing loads of buttons and manages to turn it off. The button he turned it off with was the same button he kept repeatedly pushing, meaning the TV should have turned off seconds ago if he was pushing that particular button. (00:09:30)
Other mistake: Kendra slaps the right side of Donna's face to stop her from freaking out. Donna then rubs the left side of the her face. (00:14:05)
Continuity mistake: When Cleveland asks Donna, Arianna and Kendra to be Cleveland's Angels, they are standing in front of the fireplace even though a few moments ago they were sitting down at the table on the other side of the room. (00:15:20)
Continuity mistake: Kendra is dealt a Queen of clubs and a red seven of diamonds. When the four of clubs has been dealt, the other cards are now a black seven of diamonds and a Jack of hearts. (00:16:50 - 00:17:40)
Continuity mistake: The bag of money has two piles of bundles while it is on the couch. One of the bundles is on the second pile while all of the other bundles are on the first pile. In the next shot, two bundles are on the second pile. (00:19:55)
You're the Best Man, Cleveland Brown - S1-E21
Other mistake: The clock on the nightstand doesn't have any hands on it when Donna is talking about women loving bad boys. (00:07:40)
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.