So far,there have only been 2 cameos.1.In 'Fish Out of Water when Milo blocks the T.V the video game he is playing is Super Mario Bros. 2.In the same episode when Oscar is describing his feelings for Bea, he says he is a plumber[Mario]Bea is a princess[Princess Peach]and he feels like there is a monkey throwing barrels at him[Donkey Kong].