Taylor Dooley is the only returning actress from Les aventures de Shark Boy et Lava Girl (2005). Robert Rodriguez thought that fans would be offended if he brought back Taylor Lautner only to have Lautner's face covered by a helmet the entire time and give him no spoken lines.
Les aventures de Shark Boy et Lava Girl (2005) is second Troublemaker Studios' family film to become a franchise, after Spy Kids (2001).
Ojo's drawings tell the future. Ojo means "eye" in Spanish.
Robert Rodriguez considered including Carmen and Juni Cortez from Spy Kids (2001) in this film, but decided he didn't want to cram in additional parents.
This film is a follow-up (but not truly a sequel) to
Les aventures de Shark Boy et Lava Girl (2005), also directed by Rodriguez.