Peter goes to find Neal in Cape Verde, where everybody supposedly speaks Spanish. Cape Verde is a Lusophone (Portuguese speaking) country.
The map of Cape Verde used when they plan the escape is not a map of Cape Verde.
When Agent Collins goes to see Ellen Parker at her house, you can see the door open by itself as he is knocking on the door.
The unnamed island where Neal and Moz are hiding is supposed to be part of the Cape Verde archipelago, which - as it is correctly stated - is a former Portuguese colony and an independent country where the national language is Portuguese. However, all the characters there are speaking Spanish instead, for instance when they say "gracias" when they should say "obrigado".
Collins had only just arrived on the island and did not know Neal's new identity was James Maine, yet he said it when showing the wanted poster in the cafe.