Hola Joseph
I would imagine that in California, Spanish is probably taught by Latin American teachers more than Spanish teachers, so some expressions you may hear in California are slightly different to Spanish expressions from Spain. As you may know, Kwiziq is focused on Peninsular Spanish at the moment but will be also offering Latin American Spanish based lessons soon.
Nevertheless, personally, I don't think this should as a barrier to make yourself understood in a Latin American atmosphere.
Un saludo
Inma
