Just want to bring up, what I recall from the games is that people aren't really supposed to know about worlds beyond their own, what with Donald always making a huge fuss over 'World Order', and why Sora always makes up excuses of 'not being from around here'. 

So Jane just up and name dropping Olympus like it's the next town over feels a bit weird doesn't it? Not that it's necessarily a huge deal or a hard fix, I just imagine her saying they went 'to some colosseum or something' and since she's Jane, I imagine her thinking that Rome is a long way to talk about going willy nilly, since that'd likely be her idea of where the Colosseum is.