The First-Year Aging Problem
None of the characters age during the first year of the series. Goku is 12 and Bulma is 16 at the start of the series, and a year after the Dragon Balls are used and they revive, Goku is still 12 and Bulma is still 16 when they are asked.

Any One Wish?
When Goku asks Shen-long if he can revive Bora, he says "There is no wish I cannot grant." We see time and time again in DBZ when Shen-long can't grant a wish asked of him.

Do Nameks eat?
When Popo recounts Kami's story of how he came to earth, we see Kami say that in Yunzabitt, where he landed there was no "suitable food." However, when Bulma, Gohan, and Krillin go to Namek and find Dende, Dende says that Nameks don't eat, but only need water. Then what would it matter to Kami if there was no food at all in Yunzabitt?

Trunks can't count!
When Trunks first appears, he warns Goku about the two Artificial humans that terrorize the future, he says they are #19 and #20. However, when he returns and sees #19 and #20, he has no idea who they are and says the ones that were really terrorizing the future were #17 and #18.

The Namek aging paradox
When Piccolo (Jr.) was first born it took 3 years for him to mature to nearly his full growth. However, it took Dende upwards of 20 years to mature to a fully-grown Namek. One would wonder why there would be such a difference in the time it takes for a Namek to age!

The Lump in Cell's Head
After Cell comes back after blowing himself up, he says that there is a lump in his head that allows him to regenerate as long as it is undamaged. This seems contrary to the fact that Goku blew off Cell's head and shoulders with a Kamehameha only an hour or so earlier.

People in the Room of Time And Space
Supposedly, only two people can enter the Room of Time And Space at one time, although there have been as many as four people in it at one time during the series: Trunks, Goten, Buu, and Piccolo.

The Dragon Radars
During the Buu saga, Bulma tells Goku that the Dragon Radars are made with special parts that cannot be replaced if destroyed. However, way back during Goku's run-in with Blue in Penguin Village, Turbo made a Dragon Radar out of parts from an ordinary airplane.

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