* Junior's sudden weight gain? He was always eating the amount he presently does, but due to his hyperactivity, he simply managed to burn off all of that weight. If he's now taking medication which caused his symptoms to diminish and stops him running around like he used too, he naturally put it on (or his medication has a side effect of weight gain).
* Stewie calls Cleveland and Junior chocolate people in the pilot because he's a little kid who doesn't know that calling a black person "chocolate people" could be taken as offensive. So, why did Joe do the same? Easy -- it's a joke on racial profiling because he's a cop.
* Cleveland Jr knowing Spanish in "The Hangover: Part Tubbs" is less random when you remember he dated a Mexican girl the previous season.
* On the episode "The Men in Me," Cleveland is declared the whitest black man in America. This explains why Brian (who was established to be racist against black people because of his father) never barked at him [[FamilyGuy when he lived in Quahog.]] He thought of him as a white guy.