Is Eusine still massively OOC though? Since that was a problem in the original and not with any dubbers?
Anyway, as far as the roller coasters at a festival such as the one in this episode...there's already carnival games. There's stuff like goldfish catching and ring toss and the like at "traditional" Bon festivals, and those have jack-all to do with the subject of spirits and more to do with bringing people in. And given that the pokémon world never does things by halves, it's entirely possible that there *could* be Bon festivals (and didn't someone in this thread point out that it was at the wrong time of year to be Bon anyway?) that have roller coasters. Granted, that one didn't, but there could be.