Continuity mistake: When Rocky and Colt go to the bathroom to attack Hammer after he drank the laxative, Colt thrusts a plunger to Hammer's face. As Colt thrusts it backwards, Hammer's face gets pulled forward, sending his ponytail over his head. In the next shot his hair is neat and tidy, not over his head.
Continuity mistake: During the part when Rocky, Colt, and Tum Tum are in their room, Tum Tum is playing Nintendo. You can see he is playing Super Mario Brothers 3, he beats a level and then starts singing Rocky loves Emily. When Colt says "mom's coming" Tum Tum turns off the game but its at the main menu when you first start the game. You can't go to the main menu without resetting or turning the Nintendo off and on.
Grandpa: Colt, what is a ninja?
Colt: A ninja is one who can use everything around him to trick his enemies. He and fast and he is friendly to his environment.
Rocky: A ninja is honest and good. His mind, body and spirit are one. He has self-control. He has discipline.
Tum Tum: A ninja loves nature, uh, 'cause he is part of nature. A ninja never fights a battle if he cannot win.