Dragon Ball takes place on Earth but not "our" Earth. While the crew is riding a boat towards Master Roshi's island, you can clearly see large Vietnamese letters on the side of the boat. This wouldn't be possible in the Dragon Ball "universe" as there are no such things as Thai, Vietnamese, Japanese, or any other nationalities and races.
Dragon Ball was filmed in Vietnam.
Dragon Ball was filmed in Vietnam.
During one of the final shots, Lord Horn loses his power over the huge group of people. Everyone is supposed to fall, but there is a whole group of people still standing, looking quite confused.
Turtle Man (Roshi) is being apparently being pulled by Magic Cloud (nimbus) across the water on a surfboard. The undertow and wake made by the boat pulling him are clearly visible in all of these shots.
In nearly in every fight scene, a wire is visible., most notably when Monkey Boy is flying through the Forest, the camera follows him from afar, but that white wire is clearly visible.