I just noticed, in the dub at least, in Rena's flashback...her mom calls her 'Rena', not 'Reina' (Also Rina seems to call her 'Reina' but I think that's just her VA pronouncing it wrong so I don't count that as a mistake). Is that a mistake in the Japanese version as well? Is it just because the Anime didn't really need to distinguish 'Rena' and 'Reina'?