Yes, I had similar thoughts. I don't know if this signifies anything, but - extrapolating a lot from that first photo - it looks as though the 'real world' scenes might be done in a less literal, "let's just hold up a steering wheel and we're in a car" sort of way.
On the 'theme park' vibe, incidentally, as many may have heard there is a Studio Ghibli theme park being developed in Japan. As I mentioned upthread, I think a live 'Spirited Away' might work better (if at all) as an environmental experience, so ironically, maybe a theme park would be a better medium for adapting the film after all - here I'm thinking of an entire theme park experience, rather than an abridged stage show as a single theme park attraction. The theme park website at https://ghibli-park.jp/ notes "Ghibli Park does not have big attractions or rides. It is a place to discover secrets while walking with your own feet and feeling the wind, leaving the forest and road as it is." That sounds more like an interesting 'Spirited Away' interpretation to me.