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)
Other mistake: In the casino montage, there is a shot showing us a roulette wheel that doesn't have a single number on anything. (00:04:05)
Other mistake: When Terry is saying he doesn't like being strangled, he doesn't have a reflection in the van's wing mirror. (00:14:30)
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)
Other mistake: Lester's house is directly across the street from Cleveland's. However, when the Child Services agent runs out of Lester's house with Ernie, he runs at 2 o'clock direction (which would be towards Holt's house), but instead ends up in front of Cleveland's house, which is in a 12 o'clock direction. (00:11:20)
Other mistake: Cleveland shoots the living room ceiling, but the position of the hole is much further to the right from where the gun was pointed. (00:15:35)
Other mistake: When Cleveland and Cleveland Junior start singing the Black History Month song, the second hand on the clock doesn't move along with every second. (00:00:30)
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: Donna's friend Yvette stabs a man's hand with a knife when his hand was placed on a table. Yet no damage is made to the table. (00:11:30)
Other mistake: When everyone is saying goodbye to Cleveland and Cleveland Junior, they are standing next to Cleveland's house. Then after they have left and Stewie says "What the hell? He's getting his own show?!", they are standing next to Peter's house. Cleveland's house however, is across the street from Peter's house and could have not been able to stand next to Peter's house if they are at Cleveland's house. (00:03:20)
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.