I've been watching this show called Kappa Mikey lately (I like it's odd humor), and it is chock-full of reference to basically everything. There were these two kids that sounded like and had the same hair as Luffy from One Piece; they were just small, fat, and spoiled due to their father owning the biggest toy store in Tokyo. In one of the most recent (or the most reason) episodes, there is a doctor by the name of Dr. Katashi, who has a name, hair (yellow, though), and a left eye-covering headband that is an exact reference to Kakashi Hatake from the Naruto series.
Anyways...
The Mario cameo. Well, the protagonists in Kappa Mikey are a part of Lily-Mu Studios, which produces the Lily-Mu TV show (yes, a TV show about a TV show). The characters' own video game was just upon release, and they showed what the gameplay looked like in a commercial. What do you know, it was an exact replica of Donkey Kong level-wise; it just had the TV show protagonists fighting Gonard, the antagonist in the TV show, who was throwing barrels at them while two of the antagonists dodged and managed to reach the "princess."