Maybe they just tape him reading the questions and then insert the answers when the actual interview is held. That would be like a delayed response or semi-taped interview. Who knows what methods they use in radio these days with what you have to work with.
Did I not mention
soundboard before? That's a system that a lot of people use for sound effects. You press a button and it plays back a clip.
I was listening to an April 5, 1996 episode where Art Bell was talking about going worldwide after establishing the international AT&T line. George, on the other hand hope that he's got coverage in Salt Lake City.
Also amazing is the quality of callers. I shouldn't be surprised, it's not a new thought, but the people on the phone are just so far superior back then. I guess there are more outlets for intelligent people to communicate and at time more convenient for them.