Continuity mistake: When Toad General calls for the council's attention and announces that Bowser found the Super Star, note his shirt buttons. Then, when he says that the Kongs will never agree because their mad king doesn't make alliances, Toad General's shirt is backwards, his buttons are on the opposite side. (00:24:55 - 00:25:35)
Continuity mistake: During the "Steal the Show" montage, you can see the Earth person in the background. But later, in the elevator scene, it reuses the same person from the previous scene. After, in the dancing scene, the same Earth person behind that water fountain is slow-dancing with the other Earth person.