During the martial arts tournament, Chi Chi receives a cut to her lower right arm. In the temple when she fights the copy of herself, you see it again. But at the end of the film when Goku goes to see her, there is no sign of a cut or even a scar. This is strange due to there not very long between these events.
at the end of the movie when Goku changes into the Giant Ape is factually wrong. Anyone who knows, reads, or watches anything Dragon Ball knows that Sayians can not change WITHOUT THEIR TAIL and seeing as how Goku has no tail then he could not Transform in the movie.
The goof item below may give away important plot points.
When Bulma drives her vehicle into the sinkhole, she falls in first and Master Roshi falls in last. Yet somehow, Master Roshi lands at the bottom first, and is then able to catch Bulma before she hits the bottom.