In the town itself, actually, within sight of the house in which Charlie lived, there was an ENORMOUS CHOCOLATE FACTORY!Just imagine that! (1.19)
Who wouldn't be amazed by an enormous chocolate factory? Even in the first chapter, we readers know we're in for all kinds of surprising delights.
What a tremendous, marvelous place it was! (1.20)
We haven't even seen inside the chocolate factory, and neither has Charlie. But we already know it's going to be awesome. For now, we'll just let our imaginations do the work.
Oh, how he loved that smell! (1.22)
Have you noticed just how many exclamation points Dahl uses in this story? If exclamation points don't show awe and amazement, we don't know what does.