Trivia: At the start of the movie, when Juni says, "To finding lost toys", he finds a toy that bears a resemblance to Grandpa in the red armor in the game when he finds "Megalegs".
Trivia: Most of the movie was done on only fifteen feet of green screen.
Answer: In the 2nd Spy Kids film, when they can read each other's minds, Juni proves it by thinking Carmen's feet stink, at which point she smells her shoe and agrees.