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?
Other mistake: When Snyder's assistant gives the address to his nephew, Hammer, he tells them it's 623 North Pacheco. When the Boys and Emily leave for school the number on the house is shown as 580, and there is no 623 because they live in a cul-de-sac.
Other mistake: When Agent Douglas finds Snyder on the roof about to escape on the helicopter, Snyder climbs in a rope ladder. Then Douglas fires 9 shots at Snyder. It looks like Agent Douglas is shooting a revolver, which holds only 6 rounds even when loaded.
