Taylor Dooley is the only returning actress from As Aventuras de Sharkboy e Lavagirl (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.
As Aventuras de Sharkboy e Lavagirl (2005) is second Troublemaker Studios' family film to become a franchise, after Pequenos Espiões (2001).
Ojo's drawings tell the future. Ojo means "eye" in Spanish.
Robert Rodriguez considered including Carmen and Juni Cortez from Pequenos Espiões (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
As Aventuras de Sharkboy e Lavagirl (2005), also directed by Rodriguez.