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)
Revealing mistake: Just as the first credits roll, when the cheerleaders dance, check the African American, Caucasian, and most noticeably, the Asian American people behind the team. They are blatant, creepy-looking, unrealistic CGI characters. (00:01:18)
Continuity mistake: Scott hugs his daughter and caresses her face while she holds his wrist. From the opposite angle, her hand is gone.
Continuity mistake: When Hespera and Kalypso push the glass vitrine away, it falls and shatters into a zillion pieces. Half a second later, there's not a single bit of glass around. There's a better angle of the immaculate floor when a guard jumps on top of a woman.