The scene of the tent is from Ep 2 though isn’t it. I mean you can see someone that looks like the young Regina wearing that same outfit which means that is from Ep 2. We don’t find out who Whale is till Ep 5. I don’t think that is Frankenstein.
Ok then so it’s like this Regina comes to Jefferson for help to bring Daniel back to life he says he knows somebody who can help. He takes her to Dr. Frankenstein’s world through the hat to get him to revive Daniel. In the tent it’s Dr. Frankenstein in action demonstrating what he can do or possibly already trying to revive Daniel.