The Equadorians all speak to each other in English despite their native tongue being Spanish.
The Aircraft Frank and Finch return home from Ecuador IN shows the registration number AS being simply "GSTG". In actuality, this Bombardier Challenger 605 has the Canadian registration number of "C-GSTG", the Canadian International code prefix of "C-" having been OBVIOUSLY whited out. Had this been an Ecuadorian civil aircraft, it would have an "HC-" prefix, and thus would have been "HC-GSTG".