The guy Mia stays with in the Dominican Republic, is, I'm assuming someone they know from the fourth one. although he's never in the movie, because Toretto just always knows all the "higher ups". I remember from the HDTGM episode on Fast 5 someone wondering how they were able to afford a safe like that shipped overnight. Well, in this one, it's a very unnoticed line when Mia is thanking the DR guy for letting her stay, but he says, "Dom needed a safe delivered in Rio in two days, that was a problem." So he's the one that gave it to him. I would like to say that it's actually Ludacris that gets the safe in Fast 5 but continuity isn't the Furious crew's forte.