It is possible they went somewhere else in Calama, we have to consider that this leg was filmed in two days, there is an overnight rest, you can see the clock of the hotel in the promo, so they have the time to do it. Our friend Ferrilo (
), is in the south entrance of Calama, is not that hard to find him (it) unless nobody knows who or what Ferrilo is.
Your are right, you can see one of the twins working with Marisol and Jose, so it HAS to be an intersection, a good intersection, not the seudo intersection from TARLA 2. This task has to be in Chacabuco Salpeter Office in Sierra Gorda Province, in the way between Calama and Antofagasta, but i don't understand what are they doing... disarming a rail???... this could be a route marker challenge or one side of the detour.
And the task in Enjoy Casino is only one, in the roulette game you put the chips in the table to bet.