Rocky jumps over the fence, kicks the ninja that is holding Tum-Tum, then says "Give me five!" without moving his lips.
When CJ messes with the speed control of the rapids ride, the dial he touches actually reads 'temperature control'.
Rocky punches Lothar in face, sending Lothar to the ground. When he gets up, his hair is completely messed up. When Lothar confronts Rocky a few seconds later, his hair is perfect.
When Amanda hits the emergency stop button on the ride, the ride is still spinning in the next scene as the boys are fighting the ninjas after it has clearly made a full stop mere moments before.
When Medusa tells DJ to freeze the picture of the boys and Amanda, Tum-Tum has a straight face. When the photo comes out, he has his tongue out.
While Amanda is overriding the ride control access from the master control, CJ is shown at the bottom of the list. In the next shot, he is on the same ride as Amanda.
When Medusa talks on TV and her purple lips, but in next shot in red.
The park is supposed to be on the shore. Several shots show a landlocked park.
Amusement parks do not have "Central Control" that controls the rides from a central place. The rides can only be controlled by the control panels at the ride.
Roller coaster brakes are on the tracks, not the train.
Restraints on any roller coaster can not be released from the control panel unless the train has parked in the station.
When the helicopter takes off, toward the end of the movie, an ABC television logo on the helipad is clearly reflected in the belly of the copter.
When Dave dragon is sliding down the rope with nun-chucks, his nun-chucks are replaced with a rappel.
When the ninjas and Dave dragon send the bomb away with their makeshift torpedo, it's clearly being guided on a wire.
When Dragon fights the tsunami guys on his show, his first kick misses a tsunami guy, but he falls anyway.
There is no dart from Klaus's gun that knocks out Dave.