If I were to interview Dan Brown, I'd ask stuff like (and I'm no pro interviewer here, mind you).
"How much time do you spend on researching the historical element in your novels?"
"How has the fame and/or notoriety of The Da Vinci Code impacted your life?"
"What was your inspiration to write this novel?"
"To whom did you give the first drafts of the novel for the purpose of double checking your facts?"
"Where do you see yourself going in the future with the character of Robert Langdon (AH-HA! I remembered!)?"
"Now that The Da Vinci Code has been optioned for the big screen, to be tentatively directed by Ron Howard, who do you envision playing the key characters?"
Stuff like that.
Also, if you feature the characters in your press release, don't forget to mention the French cop chasing them as well. Just thought of that one.