Other mistake: Terry and Aaron are seen behind Tori when Donna finds Cleveland having Frapps with Tori. But when the Frapp Attack video is played later, there's no sign of Terry or Aaron. (00:08:05 - 00:09:00)
Continuity mistake: When Cleveland says "We were just at work and it was just so boring and humdrum...", Tori is looking at Cleveland and Donna. But when the video is played later, when Cleveland says "humdrum", Tori is looking away from Cleveland. (00:08:10 - 00:09:00)
Continuity mistake: When Donna "frapps" Cleveland, there is Frapp on the floor. Cleveland then slips on the Frapp and it disappears into the grass. Two seconds later, it reappears on the ground. (00:08:20)
Plot hole: Several angles of the Frapp Attack video would have been impossible for Rallo to shoot. The "ow, my bottom!" angles come from a wide shot, but Rallo was never standing in such a position when it actually happened. (00:08:05 - 00:09:05)
Continuity mistake: When Cleveland gets hit with the American football when he walks into Waterman Cable at the start, he is standing next to the entrance door. In the next shot, he is suddenly standing at least 20 feet away from the door. (00:02:00)
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.