Corrected entry: During the scene where the main teenage bad guy and his two friends are holding up a convenience store, he gets a phone call from his uncle, about kidnapping the 3 ninjas. His uncle says, "here's the address." But he never actually gives it to him.
Corrected entry: Not only does Emily, after being beckoned by Fester (pretending to be Rocky) find it perfectly fine to go out in the middle of the night, she also walks right into their house without knocking. And you wonder why she got captured so easily.
Correction: I don't see how this is a mistake. She was just woken up and may not have been thinking straight. She also has no need to knock since she was asked over.
Corrected entry: When the kids are getting ready to leave for school they go out the back door. But in the next scene they are coming out of the garage and the door is opening. This means that they either went in a side door or went in through the garage door, closed it, and then opened it again when they had their bikes. So why didn't they just go through the door that connects the house to the garage? Also, if Emily left her bike on the driveway, why wouldn't she just go the front door?
Correction: It's just a choice the characters made. Choices that are made in the movie by characters are not valid mistakes.
Corrected entry: In the scene where the mom is going out, and is talking to the boys before she leaves, she is putting in her earrings. As she turns to leave one of her earrings falls out.
Correction: If the earring reappeared in the next few shots, there would be a mistake, but as it stands this isn't a mistake; earrings fall out, it happens.
Corrected entry: When Rocky, Colt, and Tum Tum are cooking dinner at their grandfather's house, Tum Tum warns Colt that he's about to throw some food his way. He throws a big spoonful of noodles. Colt attempts to catch it, but it obviously hits the plate's side and then completely falls off.
Correction: Not a mistake. He is only a ninja-in-training after all, he is not superhuman, and is bound to miss occasionally.
Corrected entry: Also from the basketball scene when the 2 ninjas are playing 2 bullies, Colt walks by and hits the fat, black boy's shoulder, that boy obviously said, "hey!" But if you watch it in slow motion, you can tell that his lips don't move.
Correction: The big bully didn't actually say anything. He made a rasping noise, which can easily be achieved without moving your mouth.
Corrected entry: In the chaotic scene in the kitchen: while the 3 boys are getting ready for school, there is an outburst of yells and question. One question is, "where is my bag?" This comes from Colt, who already has his bag on his back.
Correction: A deliberate joke to show how disorganised everyone is.
Correction: There is an alternate version of this film that shows the address being given and the thugs trying to remember it. This version is currently on Hulu as of this writing.