When we crossed into CA on I-10 we noticed that there seemed to be what looked like a border check. What on earth? Why does CA treat AZ like a foreign country in need of some kind of border patrol? It seemed to be some kind of agricultural border patrol. Does the interstate commerce clause get tossed out the window? What's up with that? We didn't experience that in AZ when we were en route to Phoenix.
Also, we stopped in Blythe for gasoline and something to eat. What I didn't expect to see in the middle of absolutely nowhere was a drive-through Starbucks! With gasoline prices at $2.69/gallon for 87 octane, how do people in the middle of the desert afford $4 cups of coffee?
Last observation. On the AZ side, I-10 had those wondrous saguaro cacti on both sides of the highway looking just grand and majestic. Cross into CA and they are gone. What you have instead is irrigated farm land. It almost did seem like we entered a foreign country.