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.
Fester: Hey dude, what time does school get out?
Hammer: I don't know. I never stayed to the end.
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