At around 36:28 minutes, when Matthew and Gabriela are talking to Boden about Rosa's age, Matthew says he heard Rosa say "me estoy convirtiendo dieciséis". This is a word by word translation of "I'm turning sixteen" and is completely ungrammatical in Spanish, as it means something along the lines of "I'm transforming sixteen". Rosa is a native Spanish speaker, she would not have said that, but rather something along the lines of A "voy a cumplir dieciséis".