When Reid and Rossi propose the theory that Kate knew Syd and Jimmy before her disappearance, and JJ expresses her skepticism, Rossi retorts "...they're handsome, charming, 19." But while reviewing the case on the flight to Maryland, JJ mentions that the boys are both 20.
Reading Syd's file, Rossi pronounces his middle name "Ex-avier" instead of "Zavier".
Xavier can be pronounced "Ex-avier" or "Zavier." Both ways are correct.