I stay at the Skirvin Hilton whenever I'm on OKC for work, and the coolest thing about it (besides the fact that it's a nice hotel) is that all the NBA teams stay there too. Never had any problems with ghosts, but did have a hell of a time trying to convince a co-worker that Earl Boykins was an actual NBA player and not just some random guy in a Wizards shirt.
But the hotel is pretty old, with a weird layout. I hadn't heard anything about a haunting until now. If I had to guess, I'd assume Curry is just angry that they don't have a continental breakfast in the lobby.