Well, I agree with the guys who say that the narrator saying witty remarks like "thievery runs rampant in your family" is totally different from what we had in KQVI. There, many impossible combinations would end in a straight-faced, but often still humorous answer from the narrator. Try to get the skeleton in the pawn shop to see what I mean, or to talk with a drum there.
On the other hand, I like the descriptions of different items in the castle which tie them to the royal family's history. For example, the answer for trying to use a vase is a good one. And the option to turn off the narrator's voice is also welcome.
But, I believe some guys like the ironic narrator type, so can't we have (for the following episodes) two, which can be switched at any time: female sarcastic and male straight-faced? (Maybe one of them should be Graham himself?) So Amy tells us all that Graham doesn't even know, and makes fun of him, but when we switch to Graham only, he says just what he sees and thinks. I know that there's more work for you, but I believe that's a bit easier than, say, modeling a new character, and increases replayability.
By the way, can anyone tell how much spoken lines does Amy have in the first episode, just to get some perspective?