What has a guy named Boyakki (fans of Time Bokan series certainly know him) got to do with Dragon Ball? Now we're going to explain...
A friend of our forum hides himself behind this nickname and enjoyed collecting some curiosities about Dragon Ball's world! Give a look and will discover some very interesting things!! ^__^

In the first Dragon Ball series, in volume #7 of the manga, Goku, while is running after General Blue, reaches Penguin Village, the home for all of the characters from "Dr. Slump and Arale-chan", the work that took Akira Toriyama to success before he began to draw Dragon Ball. This mention to the series dedicated to the cyborg girl is so evident that I believe that everyone noticed it (as long as they do not completely ignore all the other work of Master Tori besides DB)! But there are other references to "Dr. Slump and Arale-chan": the first, the most clear for those who know the series, is the mask that Son Gohan (Goku's grandpa) wears when he shows up as last fighter of Uranai Baba. It is the same that one of Arale's classmates wears!
The second is harder to find, at least because the image is shown just for a very short time (DB episode #20): when our friends of DB go to the first Tenkaichi Budokai, among all the participants, there is one shown for a few seconds... hey, but isn't that... Suppaman?! Well, he's drawn a little bit more seriously than usual and he doesn't wear is usual costum, but the sharpened ears, the blue hair and the typical hairstyle are unique!

Also in one of the movies, DBZ movie #13, there are some references to "Dr. Slump and Arale-chan"!
When our friends go and look for the Dragon Balls, Kuririn enters a horror tunnel of an amusement park and he finds... all the "usual" monsters (mummy, lagoon monster, etc... etc...) drawn with that demential style typical of "Dr. Slump and Arale-chan".
In the scene when Chibi Trunks gives hospitality to Tapion in his room, among his toys Trunks takes just a doll of Great King Nikochan (the short alien with the bottom on the head who lands at Penguin Village with his subject).
But let's finish with "Dr. Slump and Arale-chan" with some mentions about the names of his characters: the protagonist, Senbee Norimaki, takes his name from a sort of Japanese cracker called "senbei". And if this is not enough, this crackers are often accompanied with some sea plants that in Japanese are called "nori"; and the last name of this nice scientist is precisely Nori... maki!
Another character takes his name from some kind of food: Taro Soramame's father, the barber Kurikinton, takes his name from a Japanese chestnut cake.

Now let's go and examine the Z series: we find there several "references" to characters present in the "previous" DB series.
Everybody should have noticed that the director and assistant director of the movie about Great Saiyaman look like Governator Red and his assistant, but maybe you missed some others...
When the three cyborgs are travelling on the van, they are attacked by a group of bikers: one of them, the blue skin one, looks like the vampire that fights for the old Uranai Baba and is defeated by Upa and Puar.
In one of the last episode, Majin Bu fights against the fighter in league with the road swindler, and immediately defeats him, just as it happened to Goku at the beginning of DB, when he arrived in Western City in order to find Bulma, with the only difference that Majin Bu uses the money to buy ice cream.
This is crazy: in the episode of the anti-Cell refuge (U.S. DBZ episode #155 titled "A Girl Named Lime") when the mafioso guys, suggest to the population to build a bunker, just for a second, in the scene, appear two inhabitants of the village terrified by Oolong at the beginning of DB series, which precisely are the major of the village with glasses and mustaches and the granny to whom Goku had made pat pat!!!