Continuity mistake: Carmen is wearing white sneakers riding with Juni on the magnetic transporter. After jumping off the magnetic rider and entering the hidden temple, Carmen is wearing black sneakers.
Continuity mistake: On the sub, Gregorio and Ingrid are talking to Ingrids parents about the fact they shouldn't be going with them to save Carmen and Juni, and her parents are putting metals flasks down on a side to the left of the grandmother. The flasks are always visible, then the grandparents both activate cool spy gear on themselves, and in this wideshot the flasks vanished. (00:59:20)
Continuity mistake: When Carmen and Juni realise they've gone around in a circle, they run through the room of treasure again. There are some gold pots near the sword which Juni grabs later. In one shot they run past the gold pots, and one pot rolls across the coins. When it cuts to Juni grabbing the sword, the pot is back to it's original place, and the pots and coins as well as the sword differ their position between these shots too. (01:10:15)
Continuity mistake: Juni has his electronic bug tie his bow tie for his tuxedo; in the same sequence you can see a small part of the metal clip on Juni's clip-on bow tie.
Continuity mistake: When Juni is eating spaghetti in the kitchen, his spoon is empty. After Carmen speaks to him, he has plenty of spaghetti on his spoon, without putting his spoon near the plate.
Continuity mistake: In the scene when Ingrid and Carmen stand by the vanity table putting on makeup, talking, in a wideshot Carmen puts a tube of lipstick onto the table and puts her empty hands on her hips. Then when it cuts to a closeup, she has both hands up near her face and a tube of lipstick in one hand too. (00:07:50)
Continuity mistake: On the sub, as Ingrid and Gregorio are off to save Carmen and Juni, Gregorio hears a noise and goes to open a circular metal door. It turns out to be Ingrids mother. Gregorio then opens the circular glass window, and she climbs through. As she climbs through, Gregorio's left hand leans against the wall, and he lowers his arm to his side. It cuts and his hand is then instantly back against the wall, and he once again lowers his arm. (00:58:30)
Continuity mistake: When the father is playing with the yellow thing in the office, the mom comes in and he puts the toy on his lap. Immediately after, he still has the toy in his hand and then puts it down, again.
Continuity mistake: After Gerti and Gary fall in the camel poop, their clothes are clean, even though they are the same clothes they had on when they fell in it.
Continuity mistake: On the floor, behind where the skeletons stand is some assorted treasures, like vases, boxes, pots, scrolls, coins etc. The treasure on the floor [near the gold circle on the floor, which is clearly visible when Juni snatches the medallion and legs it] changes [eg. thing appear, disappear and change position] from when Juni ponders about taking the medallion, to when he takes it and runs. (01:09:00 - 01:09:45)
Continuity mistake: When the spy kids first meet Romero, just before he says "It's science," we can see him push the lever to turn the small island's volcano, but in the next shot or so, we can see that it is off. (00:49:50)
Continuity mistake: As Gary and Gerti make it to the beach, Gary says he is going to "zap" the monster in the ocean. When they show him trying to zap the monster, his watch strap is undone, but when it cuts the strap is now secure.
Continuity mistake: When Ingrid enters Gregorio's new smaller office, she sits at his desk, and they look at photos. Through the scene, between [different] consecutive shots, items on the desk move, such as the yellow toy Gregorio places on the desk, the silver rocket, and the mouse on the mouse mat. (00:37:35 - 00:38:50)
Continuity mistake: In the opening scene of Ingrid and Carmen at the vanity table, a green fern stands right beside the left side of the vanity table. In later close ups of Ingrid and Carmen in the mirror, the whole left side is clearly visible, yet the green fern is not seen, whereas in the previous shots the fern leaves were hanging right over that side and should be visible. (00:07:45 - 00:08:30)