So is Chemical Plant located at Fukushima now? The background is a bit iffy. It also looks awful with Modern Sonic. I am sort of disappointed.
Tails' classic model is also the wrong colour and too artificial looking (like a plastic figure). I would have preferred they included an in-game model with it, as Sonic looks a lot different in CGI compared to in-game. Though it is not like you actually use Tails in the game, so it is not very important, just another misleading advertising gimmick.
Overall the classic content is looking alright, just slightly flawed, which is a big improvement. It is too bad the game is 90% non-classic content. Even being optimistic, I cannot care for it. For Sonic's 20th anniversary they should have made a full classic game like everyone expected with Sonic 4, not some weird remix that looks like a fan game in concept.