User blog comment:TheCarrotSaysYumYum/FT0 8 - Magnolia is on Fire?/Blue Cat Happy, Review./@comment-5593752-20150220215804/@comment-7418318-20150220230819

Juvia seeing a clear sky.

In the Phantom Lord arc she made it quite clear that it was the first time ever that she's seen a clear sky after Gray defeated her and yet in this chapter she saw a clear sky too.

Since this is such a monumental occurance for her, she'd never forget something like that for the rest of her live, much less within a few years.

And she actually saw Gray and reacted quite strongly to him, so again it's very unlikely that she wouldn't recognize him in the Phantom Lord arc, which she clearly didn't, so that actually makes two breakings of canon, not just one.

And don't even get me started on Jude also being in that town just at the same time as both Gray and Juvia and paying for Gray's train ticket, though that's merely stupid without breaking canon. Gray could just as well have gotten the money from some random pick-pocket victim or get a bounty for catching the thief without brute-forcing Jude and Lucy into the story, especially for such a minor role. They were basically just there for being there.