crossover

Well, Final Fantasy X-2 IS a sequel to letter X of the series, so naturally there are some crossovers. By 'crossover' I mean little things (like names or sayings) that are originally in Final Fantasy X and have newly appeared in one form or another. And for the sanity of everyone here, I have excluded characters, places and fiends (since those are kinda self-explanatory) -and chocobos.

ONE (1)
What? Rikku's weapon in her warrior costume was Auron's ultimate weapon in X.
Wonder  why... This made me automatically think of the swarm of AuronxRikku fans over the net, but cannot bring myself to believe it. I mean, Yuna has Tidus' sword as a warrior, Rikku has Auron's....a reminder that she can be as great as Sir Auron, perhaps?

TWO (2)
What? Rikku's previous overdrive has turned into an ability for the alchemists.
Wonder why... Not much wondering about this, but I guess they wanted to keep it. Since Al Bhed are a sort of techy people, the alchemist dressphere is probably the Al Bhed of the dresspheres (that's what Gippal is wearing, right?). Since Rikku is an Al Bhed and her overdrive was mix, it kind of makes sense to put it into the sphere.

THREE (3)
What? The feathers at the end of her braids have moved to her ears.
Wonder why.... This isn't really a crossover, but I was running out of ideas. I guess she just wanted to keep them because of their color or some unknown personal reason.