When Rachel first talks to Sunshine in the bathroom, she says Sunshine is an exchange student from the Philippines. Jake Zyrus was actually born in San Pedro, Laguna in the Phillipines.
Coach Sylvester criticizes Santana for being too young to get plastic surgery because her character got breast implants over the summer. This can be regarded as a comment on the widely reported rumor that before starting to film his role on Glee (2009), Jake Zyrus received Botox treatments (Botox is also a cosmetic surgery procedure).