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: When the group fly towards the accident on the bridge, from the aerial angle there are barely no people next to the smashed red car; a second later, there's 10 people around. Furthermore, the cars behind in a V-shape position are different: silver and red swap to dark grey and brownish. And, last but not least, the blue car's right door is open in the aerial shot, but closed an instant cut later.
Continuity mistake: Scott hugs his daughter and caresses her face while she holds his wrist. From the opposite angle, her hand is gone.