During Snyder and Grandpa's fight, Grandpa knocks Snyder's sword out of his hands. In the overhead camera shots that follow, the sword is still there on the mats, but in the "from the side" camera angles that follow, the sword is gone.
When Rocky Colt and Tum Tum go into the construction zone to do jumps, you see Fester and his guys driving along side of the boys until they hit the police car where it is assumed the boys would keep going. You don't see the boys turn around yet somehow they are behind the van teasing them in the next scene.
When The Boys are battling Snyder's Ninjas in the training room of the ship, at one point a Ninja charges and jumps toward Colt. In the next shot, the charging Ninja now has a sword in his hand (possibly only seen in the Unrated version).
The kids use a tin can telephone throughout the movie, but both ends are mounted on lamp stands with the cable being loose. Tin can telephones only work if the cable is taut. Otherwise, the vibrations wouldn't reach the other side.
Fester,Marcus and Hammer wake up in their van while Rocky,Colt,Tum-Tum and Emily ride by yelling.Hammer says,"Dude! There they go!" however,he hadn't seen the kids yet.How did he know they were the right kids?
When Tum-Tum runs into the kitchen to get the vegetable oil for the upstairs hallway he gets on his tip-toes to open the cabinet. When the camera changes to a different angle and shows him barely being able to open the cabinet, an adult arm wearing Tum-Tum's bracelet comes in from the bottom left part of the screen and grabs the vegetable oil.
When Grandpa Mori is fighting the 3 ninja's and Mr Brown in the narrow hall way on the ship, after he has knocked them all out (Brown knocking himself out) and he puts his hands in the air, you can clearly hear someone laughing off screen. Just before that after Mori knocks the 3 ninjas out with the flying kick, you can hear one of the boys saying "yaa!" even though they are meant to be on another part of the ship.