My experience is that not even all the outlets from 1 bank have the same requierments. While it was very difficult to open a Banco Popular account in Jarabacoa, it is no problem at all in Cabarete. Maybe because they are more used to expats.
Banco Popular in Jarabacoa, the outlet close to the cemetary, wanted 3 references from customers (Dominicanos) of Banco Popular. They accepted 2 friends, and my contract with Orange. The other outlet demanded a letter of reference, and a bunch of other crap. On top of that they changed it everytime.