Especially the FF7 soundtrack is always a good source of inspiration. I hope they won't change the OST too much when the FF7 remake comes out ... Or maybe they will add an option to switch to the old one? Might be too difficult, though.
So early in the game, when driving at night and Ignis was going on about the dangers, Prompto whined that he needs his beauty sleep and Gladio responded to that with "Eh, you're pretty enough already" (in the german version at least) and I just couldn't stop thinking about it even though I know that this is a perfectly normal tease. Ahem.