Continuity mistake: Muten wakes up and he hits Goku, sending him against the wall. Some slips of paper begin falling from the desk, but the quick cut to Chow Yun-Fat's face stops that from happening, everything that was falling off is perfectly still. (00:29:30)
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: When Muten starts doing his silly posing saying his name, Emmy Rossum has in a close-up her wisp of hair comically looped across one eye. When she was seen earlier as the posing started, the hair was okay; it was messed up when she was getting up earlier. (00:30:36)
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)
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: While Chi Chi is sparring with the guy who hits her with not much fair play, some guy is doing kung fu forms on a tall pillar. Chi Chi disposes of the opponent, jumps off to greet Goku, and the guy suddenly vanishes from that peak. (00:36:10)
Continuity mistake: Chi Chi asks Goku to take a walk with her. They do, and end up standing in a gorge; depending on the angle of the take, Chi Chi's hair is windblown or not. Especially obviously at the beginning when a big wisp of hair gets blown across her face as she says "Before you suddenly took off", and then everything is completely quiet with no wild hair in the close-up that follows. It keeps happening. (00:36:20)
Continuity mistake: At the very crowded secret training spot, Chi Chi and Goku are interrupted in their chat by Muten yelling his name. The trainees are turned facing away from the camera and some guy with a jumpsuit similar to Goku's in the anime is kinda wandering by Muten. Cut to Goku and Chi Chi, the wandering guy vanished and all the students are shadow punching towards them, and they'll stay that way for the rest of the scene. (00:36:50)
Continuity mistake: Bulma and her passengers are driving through a fairly horrid-looking green screen. They are proceeding along a street coasted with a fence. She takes a sharp left turn, Goku loses his balance, but the view shown has the fence already at distance. (00:37:55)
Factual error: The Dragonball gang falls into Yamcha's trap. The bike nosedives into the hole, with Bulma driving (Muten and Goku should by every mean have been able then to jump to safety, but let's forget about that a moment). Goku and Muten somehow land first, and Bulma comes down last after a couple seconds, screaming. Not really making sense from a physical standpoint. (00:38:05)
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: Bulma asks the others to let her handle the talk with the handsome stranger at the top of the hole. When she says "I'd be uh, so grateful..." you can see the backpack Roshi was salvaging, perfectly propped against the bike. But in the previous shot it was just lying around on the ground. Inconsistencies between different angles keep repeating during the whole bit. (00:38:35)
Continuity mistake: Yamcha falls on his butt once Muten hops up from the pit and faces him. He holds on to the car's fender and pulls himself up in the reverse shot, when Chow Yun-Fat says "Send down a net." Cut to Goku and then he's again down and holding on to the fender. (00:41:10)
Continuity mistake: Searching for the ball in the lava pit, Bulma holds the radar in a close-up with both hands, the left one has a finger pointed underneath the fingers of the right. In the previous and following shot she 's running the index in front of them. (00:43:40)
Continuity mistake: After creating a videogame-like bridge in the lava pushing enemies in it, Goku jumps on the parapet. There's an obvious inconsistency here; in the first shot when he puts his hands on the edge, Bulma and especially Yamcha are nowhere near ready. In the following shot Goku has yet to pop the head past the edge but Yamcha and Bulma are leaning against it comfortably already. (00:45:25)
Other mistake: Once Goku has punched Mai in the face, his friend joins him and there's a shot of the monster corpses in the lava shifting and being swallowed by the incandescent substance. In the green screen background conversation with Muten though, the corpses are still there, completely unmoving - not that it made any sense to begin with that they'd stay put, indestructible, forever. (00:46:35)
Continuity mistake: During the Mai vs Chi Chi fight at the Toisan tournament, many different takes have been edited together, since the referees appear in semi-random positions on either side of the fighters. (00:49:20)