Directed by: Jon Turteltaub
Starring: Victor Wong, Max Elliott Slade, Chad Power, Michael Treanor
Revealing mistake: There is an obvious stunt double for Grandpa during the fight scenes.
Revealing mistake: At one point during the big ninja fight scene at the beginning of the movie, the grandfather grabs the arm of a ninja holding a katana and bends it forward. Not only does the katana bend like rubber here, but after he knocks the ninja out and it falls to the ground, it bounces up and bends even more.
Other mistake: When the three ninjas are kidnapped and locked in that room, Tum-Tum is complaining about being hungry. Later on, before the fighting match between Grandpa and Snider, Tum-Tum gives Grandpa jelly beans. Why didn't Tum-Tum just eat those before?
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