When Lavar Brown is talking to Rallo, he says he should have had another child instead of trying to perfect Cleveland. However, it is shown that Cleveland had a brother named Broderick. Lavar repeats this in "You're the Best Man, Cleveland Brown". Lavar has a thought of dozens of possible children from various women although it may be possible that Brodrick is Cleveland's half-brother.
When Rallo plays football with the family, he is dressed like a Dallas Cowboy. He also jumps over Cleveland in a Mario-type style leap.
Tim refers Federline as the 'Friedman boy'. His name is later confirmed to be 'Gabriel Friedman' in "Brotherly Love".