Continuity mistake: After he's been shot, Goku is lying on the ground with his eyes closed; they are open during the rest of the scene once the shot with Muten saying "He's alive" ends. (01:00:00)
Continuity mistake: When the fake Chi Chi points the gun at Goku, her hair suddenly is all the way in front of her arm/shoulder, in a noticeable difference with the previous take. (00:59:25)
Continuity mistake: When Bulma falls in Muten's arms, on the overhead shot you can see her knock the sunglasses off his ear. In the close-up though, Chow Yun-Fat wears them perfectly. (00:38:05)
Continuity mistake: Goku kneels by the grave of his Grandpa. His hand is on a stone, showing a white stripe between thumb and index. In the close-up, the stone is turned differently. (00:22:15)
Continuity mistake: In the close-up of her DBE in front of Roshi's house, Bulma is holding the device with both hands. She is browsing it with just the left hand in the wider shot. (00:28:00)
Continuity mistake: When Goku calls forth Shenron, Chow Yun-Fat is lying in a different spot on the ground between the wide shots and the close-up (look at the rock by his ear). (01:13:15)
Continuity mistake: Bulma and Goku talk about the upside of working together. Emmy Rossum's hair when she stands in the door is agitated by wind or not, changing position. (00:26:05)
Continuity mistake: When Goku asks Bulma "Did you kill my grandfather?" he's close enough to the doorframe to leave a shadow on it with his fist, unlike the previous shot. (00:23:46)
Continuity mistake: Master Muten Roshi sends Goku flying onto a table, breaking some white china. In the shot when Goku actually stands up, the shards are totally gone. (00:29:50)
Continuity mistake: Chi Chi turns around after being hit by the guy she's practicing with; her ponytail flips side in the reverse shot. (00:36:00)
Continuity mistake: Mai takes the dragonball from the long-haired woman of the mid-aftercredits (Seki); when she comes out of the manhole, the leather pouch doesn't have its string hanging loose from the left, but it does when Mai comes closer. (00:09:50)
Continuity mistake: Goku slides on the ground and gets a faceful of a mushy watermelon. When he stands, his shirt is dirty and with pulp all over, but his cheek and hair are clean and dry. (00:03:40)
Plot hole: Muten sees Goku perform the technique his Grandpa used, and says "Shadow Crane Strike. I'd recognize that anywhere. How's Gohan?" A few scenes later he goes "Shadow Crane strike is the most basic of all the air-bending techniques." Which is it, Gohan's technique or a generic level 1 airbending spell? (00:30:55 - 00:34:50)
Factual error: Piccolo evaporates a lake to more comfortably search for a dragonball at the bottom. When he retrieves the ball, he's surrounded by various green-yellowish bushes, which certainly would have not grown at the bottom of a lake. (00:34:30)