When Pepe arrives in the minivan, Alan asks him to "help them with their stuff," meaning load the group's luggage into the vehicle. They have no luggage.
At the beach bar, Tyler order coffee for Paulina. About a minute later one sees a styrofoam cup and lid in front of her, but clearly there is only about an inch of coffee in the cup (from which she didn't drink).
The bunker door locks from the inside, so none of the people could not have been trapped inside.
The opening sequence is supposed to be in Saipan in 1670, but the man with the knife is clearly Caucasian.
During the attempt to exit the bunker, they pull on the door, which won't open. Quite clearly, the latch is engaged and no one attempts to unlock it.