Continuity mistake: Early in the movie, the kids go moto-surfing and the jeep they are riding in changes from having a door to not having a door.
Revealing mistake: When the kid is playing the Game Gear and says 'I thought I was playing Shinobi. This isn't Shinobi. Where's Shinobi?', there is no game inserted in the Game Gear.
Other mistake: They live in Los Angeles. When they left to go to Patusan, the scene showed a map and a toy ship with someone's hand guiding the ship along. On the ship they came from the Atlantic, through the Panama Canal, to the Pacific then onto Patusan. How did they start from the Atlantic when they lived in Los Angeles?
Revealing mistake: When they are surfing using the boards they cut from the trees, you can see the ankle cuffs on the boards, clipped on to the actors. They didn't cut the ankle cuffs as seen earlier and when they are running to the sea they don't have cuffs either.
