Continuity mistake: When Bulma and Goku have just finished fighting and begun talking; watch Bulmas' blue streak of hair. It's on the left side of her head throughout the conversation until goku says "you might need back up." The camera shows a close up of them shaking hands, and when it cuts back to Bulma, the blue streak is on the right side of her face. There is no indication of her moving it, and there's not enough wind to blow it to the other side.
Trivia: The house used in the film as the one where the master lives, is the house in the news called the "nail house," where the owners refused an order to move because of construction. In the southwestern Chinese municipality of Chongqing, the modest two-story brick structure - a dot on the decimated landscape - is called the "nail house" because it seems to be nailed to the ground by its owners' stubbornness.