It seems odd that Ingrid and Gregorio would have a big fancy wedding with their relatives and friends, considering it leads to assassins trying to gun them down. Then you see them suited up with parachutes and an escape boat; they wanted to make a public declaration of their love, to ensure that neither of their agencies would recruit them again. It was a case of Burning the Ships in hindsight, only it didn't work because Devlin is enough of a Reasonable Authority Figure to overlook the insubordination when asking Gregorio to investigate missing agents.
The reason why Devlin initially wants to just recruit the kids: Carmen and Juni are brimming with potential considering they jumped onto a mission that was sabotaged by an inside Mole. Devlin wants to see if they can handle an actual mission, without their parents' help, to test their strengths. He's impressed when Carmen and Juni insist their parents and Machete are coming, meaning he gets five spies back at once rather than two.
The whole of the third movie is about preventing the Toymaker from escaping cyberspace, but once he does, it takes about five minutes to defeat his robots. It's not hard to argue that the Toymaker never wanted to take over the world; he just wanted to escape. He just had to make the OSS think he was a big enough threat so that they'd send someone for him to manipulate through the game.
Of course the broken game glasses are perfect. Romero spent so much time using his own broken pair of glasses that he just might not be able to see as well with a non-broken pair.
Watch Spy Kids 2: Island of Lost Dreams. There is a scene where the kids are fighting skeletons on the island. The skeletons are the same size as them. As in, undead children!
Or possibly undead midgets. Or pygmies.
While we don't see anyone die in the films, it is indicated that they do go on other missions (i.e., after the first film). They've probably had these other missions go a lot worse, and the whole series could be taken Darker and Edgier and if you think about children being forced to kill its pretty horrifying. No wonder Juni wants to quit at the end of Spy Kids 2.
When we first see the footage of Carmen in the third movie, both of her arms are normal, later we see her with a robotic left arm, if Carmen was plugged in like Juni was, and what I think happened happened (she lost her arm in like the MegaRace or something like that) she felt the pain of her arm getting torn off geez.
That or it's just an upgrade that you can purchase in-game.
So if Minion was going to replace all the world officials' kids with robots, what was he going to do with the originals?
Romero's miniature zoo idea seems like a good one in theory. Then you think about how hard it is for most kids to take care of one pet, real or digital, and expand that to a whole zoo...
The fourth film has a room full of Continuity Porn, with gadgets, costumes and props from the previous three movies. This includes Carmen and Juni's battle suits from Game Over, which didn't physically exist.
Maybe they're replicas Carmen and Juni commissioned.
The children of the most important people in the world are all apparently the exact same age...
Wilbur (the dad) in 4 hosts a TV show about finding and exposing spies (in the same way one might try and track down cryptids). As in, tracking down and exposing government agents doing their jobs. Presumably the only reason why the OSS hasn't shut him down is because he's so bad at it.
