Outages or failures during the booking process — normal.
Differential fare bucket offerings particularly for Chile domestic flights vs. their international sites — normal.
Today found new tidbits.
An international round trip was over $47 USD cheaper if purchased as separate one-ways.
And there are fare bucket differentials that the international site/s (the US one in this instance) may have over the Chile site for international flights. The inventory of a lower priced fare bucket for SCL-LAX was more plentiful on the US site vs. the Chile site with a difference of over $200 USD.