I don't really like it...
I mean it's ok, but how they "see" the Arata characters just feels awkward. I thought it was like quantum leap at first, which is still awkward, but then in following episode they noticed the duffle bag, the lack of shirt on fantasy Arata (to name some things). I don't know why, but it just bothered me how every seems to react: "Oh he has some outlandish clothes, different mannerisms, short hair, and a weird bag? Pffff, looks just like he always have."
I don't know why I let this part bother me so bad.