Mary states the the 'birds of paradise' flower is the state flower of California during the Independence Day party. This is incorrect, however the 'birds of paradise' is the official flower of the city of Los Angeles, where the movie takes place.
Despite all the references through the move none of the leads are Mexican or Mexican related. Camilla Belle was born in the USA to a Brazilian mother and an American father. Alexa PenaVega was also born in the USA to a Colombian father and an American mother.
New-age version of Jane Austen's Sense & Sensibility.
Both Camilla Belle and Alexa PenaVega had to get dark spray-on tan to make them look a bit more Mexican.