Something my sister and I found funny about the Hall itself was that in nearly every room, the leaflets informed us that "This may look like a dining room, but it was actually a bedroom" or "Although this room is now furnished like a nursery, originally it was..." and so on. None of the rooms seemed to have originally been what it was made to look like today! And yet it all appeared very authentic.
As for the ghost stories, my sister found an episode of "Most Haunted" about Nunnington Hall on youtube. I watched it the other night and found it hilarious - you don't hear or see anything you would not expect in such an old building anyway! Most of the time, you can't hear anything anyway, because the "investigation team" are making so much noise, going "Oh! What was that!" and "Did you hear that?" and "I think I saw something over there!". Watch it if you like - there is a lot of beautiful footage of Nunnington Hall by day.